Connecticut is small enough that you might expect one date to cover the whole state. In spring, it nearly does: Ruby-throated Hummingbird shows up in the Litchfield Hills, along the Southwest Coast, and on the Southeast Coast in the very same week each year. Fall is a different story. The hills peak first and empty first, the Southwest Coast holds its birds two weeks longer than anywhere else we track, and the state's second hummingbird — Rufous Hummingbird — doesn't even start its Connecticut season until the Ruby-throateds are gone. Here's how the year actually unfolds, month by month.

The short answer: the last week of April everywhere in the state, reliably common by the first week of May, a statewide peak in the last week of August, and gone by early October — late September in the hills, mid-October along the Southwest Coast.

Connecticut's Hummingbird Season at a Glance

Before the month-by-month detail, here's the whole season in two pictures. The first is Ruby-throated's full-year curve — the only species with enough Connecticut sightings to fill a chart on its own. The second is the same year for Rufous. It gets its own chart because Ruby-throated's peak is roughly seventy times higher than Rufous's: drawn on one shared scale, Rufous flattens into a line along the bottom axis and its real season disappears. Scaled to its own numbers, the shape is plain — nothing in spring or summer, then a genuine late-fall and winter season.

How often each species turns up on eBird checklists, week by week — statewide, 2016-2025. Source: eBird bar chart data (Cornell Lab of Ornithology), 2016-2025 (pulled Aug 2026). Connecticut's four rarer species — Calliope, Black-chinned, Broad-billed, and Mexican Violetear — are all real, committee-accepted birds, but with between one and six records apiece they never register above eBird's reporting floor and can't be charted.

Regional Arrival and Departure Snapshot

Here's the same timing on the map. Every region arrives in the same week — but look at the departure lines: the hills empty by late September, the Southeast Coast by early October, and the Southwest Coast holds on into mid-October.

January: Quiet for Ruby-throated, Watch for Rufous

Ruby-throated numbers sit at zero across all three counties we track in January. But the first week of the month is one of the better Rufous Hummingbird stretches of Connecticut's entire year — statewide, only the November weeks and the first week of December are busier, and in Fairfield County the opening week of January outranks every week in December. These are birds that arrived in the fall and stayed. If you've left a feeder up, this is a week to keep an eye on it.

January is also the tail end of Connecticut's Calliope season. Of the state's six accepted Calliope Hummingbird records, the Guilford bird of 2010 was first identified on 10 December and last seen on 1 January 2011 — a western species wintering on the Connecticut shoreline. If you see any hummingbird in Connecticut this month, photograph it and report it to the Avian Records Committee of Connecticut.

February & March: The Deep Quiet

February and March are the two months where our data shows nothing at all — no Ruby-throated, and after the first two weeks of February, no Rufous either. There's no scouting, no stragglers, no regional exception in any county. If you're the type to plan ahead, this is the stretch to give your feeders a thorough off-season cleaning so they're ready by mid-April.

April: The First Scouts, Then Everyone at Once

April is when Connecticut's season begins — barely, and then all at once. The third week of the month brings the first real scouts: a handful of reports in Fairfield and New London counties, nothing yet in the hills. Then in the last week of April the whole state switches on together. Litchfield, Fairfield, and New London all cross the same threshold in the same week, and the Southeast Coast leads the way with more than twice the reporting rate of either other county. This is the earliest, most adventurous males pushing north ahead of the main wave. A late-April cold snap isn't unusual in Connecticut, and a stocked feeder is a real help to an early arrival caught in one.

Get your feeder up before the first bird arrives, not after. Connecticut's arrival is unusually synchronized — the whole state lights up in one week — so there's no "my region gets them later" cushion here; a feeder that goes out mid-April costs you nothing, while one still in the garage on the last week of April costs you the sighting. April is also the month to check last year's feeder for cracked seals and worn ports before the season depends on it. AspenPerch® has a built-in ant moat and a Polyperch® comfort perch, so birds rest between sips instead of hovering through the whole meal. Shop AspenPerch® →

May: The Wave Fills the State

May is Connecticut's real arrival month. Statewide, Ruby-throated jumps from under 3% of checklists in the last week of April to over 10% in the first week of May and 15% by the third. Every county we track is reliably common by the first week of May — no regional lag at all. What does differ is intensity: New London County runs hotter than anywhere else in spring, peaking near 23% in the third week of May, while Fairfield and Litchfield sit in the 13–17% range. If you live in southeastern Connecticut, your May feeders are the busiest in the state.

"Arrives" is the first of two consecutive weeks where at least 1% of a county's checklists report the species, backed by at least five actual checklists — not the scattered scout birds of mid-April. "Reliably common" is the first week a county's reports reach 25% of that county's own seasonal peak. We checked the number of checklists behind each of these, not just the percentage: the arrival week rests on 71 to 127 checklists per county and 627 statewide, so the same-week result is real, not an artifact of one thinly-birded county crossing a threshold on weak data.

June: Nesting Season Settles In

Statewide activity eases slightly through June, holding in the 12–14% range as birds settle into nesting. Females become secretive around the nest during this stretch, which can make feeder activity look quieter even though the birds haven't gone anywhere — they're spending more time incubating and less time visibly perched. Males take no part in nest duties and stay visible and territorial. The Southeast Coast still leads, with the Litchfield Hills close behind in the mid-teens all month.

Nesting is the demanding part of the year, and nectar alone doesn't cover it. A female laying eggs needs a real source of calcium, which sugar water simply doesn't provide — it's why Pop's Nectar is formulated with calcium and electrolytes rather than sugar alone. Shop Pop's Nectar → Read more on the research behind it.

July: Building Toward the Peak

Activity climbs steadily through July, from about 15% of checklists statewide early in the month to nearly 18% by month's end, as the first broods fledge and juveniles join adults at feeders and flowers. The climb is steepest in the hills: Litchfield County goes from 18% to nearly 25% across the month, already ahead of both coastal counties. This is typically the most crowded a Connecticut feeder gets before the true peak arrives in August.

August: The Statewide Peak

August is Connecticut's busiest hummingbird month by a clear margin. Statewide, Ruby-throated climbs from 21% of checklists in the first week to 26% in the last — the single highest point of the year. The Litchfield Hills peak first and highest, hitting 35% in the third week of August, the top figure anywhere in the state all year. Birds are in hyperphagia, the intensive pre-migration feeding phase: a Ruby-throated Hummingbird weighs about three grams and packs on fat worth roughly another quarter to a third of that before heading south — banding work on the Gulf Coast has found the heaviest birds arriving with nearly double their lean weight in fuel. A thin scatter of Rufous reports appears in the third week of August, but the real Rufous season doesn't begin until October.

This is the month to be generous, not economical. Connecticut's birds are putting on fuel for a flight that ends thousands of miles south, and a feeder that runs dry mid-surge is a missed meal at the worst possible time. The 2lb Nectarlyte® powder or the Nectarade® liquid concentrate keeps you topped up through the busiest weeks of the year. Shop Nectarlyte® 2lb →  |  Shop Nectarade® Concentrate →

September: The Hills Leave, the Coast Holds

September is when Connecticut's hummingbirds leave — but not together. Statewide, reports hold near 26% through the first week, then fall to 7% by the last: a two-thirds drop in three weeks. The Litchfield Hills go first and fastest, sliding from 28% in the first week to under 5% in the last — by late September the hills are effectively done. The Southeast Coast follows a week behind. The Southwest Coast does something different: Fairfield County actually reaches its own seasonal peak in the second week of September, at 32%, and still holds 26% in the third week when the hills have collapsed. The most likely explanation is birds from farther north moving through the shoreline as the local nesters leave — either way, Fairfield's feeders stay busy well after inland ones have gone quiet. Wherever you live, keep feeders full through September — a departing bird's last Connecticut meals are the ones that matter most.

October: Last Stragglers Leave, First Real Rufous

October is when the last Ruby-throated Hummingbirds leave Connecticut, region by region. The Litchfield Hills drop below 1% in the first week; the Southeast Coast follows in the second; the Southwest Coast is the last to empty, holding just above 1% into the second week of October before fading to scattered stragglers. Statewide, the third and fourth weeks of October still show a few lingering birds — thin, but real. October is also when Rufous activity genuinely begins, with the third week of the month the first real pulse of the season. And it's the single most important month in Connecticut's rarity record: four of the state's six accepted Calliope Hummingbird records began in October (Simsbury 2008, Stonington 2011, West Haven 2015, Stamford 2020), and both accepted Black-chinned Hummingbird records were October arrivals — Fairfield in 2013 and South Windsor in 2022. Pop's tip: keep at least one feeder up for two to three weeks after your last Ruby-throated sighting, and consider leaving it up through November if you'd like a shot at Rufous — or something rarer.

October is the planting month, not the tidying-up month. Sow native wildflower seed now and it gets the cold, moist Connecticut winter most varieties need before they'll bloom reliably next spring — the same spring your hummingbirds come back to. Shop the Perfect Little Sanctuary® blend →

November: Peak Rufous-Watching

Ruby-throated is essentially absent statewide in November. This is instead the best month of the year to watch for Rufous Hummingbird, Connecticut's one regular hummingbird visitor from the west. The second week of November is the single busiest Rufous week of the year both statewide and in Fairfield County, where the reporting rate runs more than four times the statewide figure — this is a Fairfield County story above all. Rufous turns up often enough that the Avian Records Committee of Connecticut removed it from its review list years ago "because the number of sightings has increased"; as early as its tenth report the committee was already calling the pattern "an especially strong recent trend of western hummers appearing in the east in autumn." If a feeder-visiting hummingbird looks fiery orange rather than green-backed this month, there's a real chance it's a Rufous.

If one bird is chasing everything else off, that's Rufous behaving exactly as expected. Rufous is genuinely territorial, and a single feeder with a swing beside it tends to become one bird's guarded patch — it perches on the swing to watch the feeder it's already defending. A second feeder and a second swing, placed out of sight of each other, gives the next bird its own station to claim instead of a fight over yours. Shop a second feeder →  |  Shop swings →

December: Rufous Tapers, Rarities Linger

December carries the tail of Connecticut's Rufous season, with reports easing week by week but never quite reaching zero — and, as January shows, some of these birds stay right through the turn of the year. December is also when the state's rarest hummingbird records have run to their end. Connecticut's first Calliope Hummingbird, a female at the butterfly garden at Lighthouse Point Park in New Haven, was present from 2 to 7 December 2006 and banded on the third. The second Black-chinned Hummingbird ever recorded in the state, a young bird at a private feeder in South Windsor, arrived in mid-October 2022 and stayed until 23 December, when the committee's report notes it "probably succumbed to the extreme cold." Both were birds that turned up where somebody was still paying attention in the cold.

The Year at a Glance

Frequently Asked Questions

When do hummingbirds come back to Connecticut?

The last week of April, statewide. Unusually for a state with real hills and a real coast, our data shows Litchfield, Fairfield, and New London counties all crossing the arrival threshold in the same week, and all reliably common by the first week of May. Feeders should be up by mid-April — the first scouts appear on the coast in the third week of the month.

When do hummingbirds leave Connecticut?

In stages, from the hills to the coast. Ruby-throated Hummingbirds leave the Litchfield Hills by late September, the Southeast Coast by early October, and the Southwest Coast by mid-October. Statewide, reports fall from 26% of checklists in the first week of September to 7% in the last, and to about 2% by the first week of October. A few stragglers linger into late October, but for most of the state the season is over by the second week.

When do hummingbirds leave the Connecticut shoreline?

Later than the rest of the state — and Fairfield County later still. The Southwest Coast doesn't even reach its own seasonal peak until the second week of September, and it's still holding 26% of checklists in the third week while the hills have dropped to about 13%. Fairfield County is the last part of Connecticut to empty, in the second week of October. New London County, on the Southeast Coast, sits in between: past its peak by early September, and effectively empty by the first week of October.

When do hummingbirds migrate south from Connecticut?

Southbound movement is under way by the second week of September and largely finished by the first week of October. The birds are fueling for it through all of August — Connecticut's statewide peak in the last week of August is the pre-migration surge, and the Fairfield County peak two weeks later most likely reflects birds from farther north passing through the coast on their way south.

How long do hummingbirds stay in Connecticut?

Roughly five and a half months for the typical Connecticut yard — the last week of April to early October, with a couple of extra weeks along the Southwest Coast. Add the Rufous season, which runs October through January, and the practical "hummingbird watching" window stretches to about nine months.

Should I keep a feeder up through a Connecticut winter?

If you want a real shot at Rufous, yes — November is the peak month, the first week of January is worth watching too, and Fairfield County is where the odds are best. Every one of Connecticut's six accepted Calliope Hummingbird records and both accepted Black-chinned records fall between October and January, and more than one was found at a feeder somebody had left up. If a hummingbird shows up at your feeder after the Ruby-throateds have gone, photograph it and report it — the state's committee still reviews Calliope, Black-chinned, Broad-billed, and Mexican Violetear.

Why We Built This Calendar

Pop's Birding has been helping hummingbird lovers for three generations. One of the questions our customers ask most often is "When do hummingbirds arrive and leave my state?" — we built this calendar to give a direct, sourced answer, not a generic one. Most timing advice online gives a single date for an entire state, and for Connecticut's spring that's almost defensible. For its fall, it isn't: the Litchfield Hills are done by late September while Fairfield County is still at a third of its checklists reporting hummingbirds, and doesn't empty until mid-October. A single "they leave in September" line would be two to three weeks wrong for everyone along the Southwest Coast. We wanted a calendar that tells you the truth for where you actually live, not an average that's wrong on the coast and early in the hills.

How We Built This Calendar

We pulled eBird bar chart data for Connecticut statewide and for three counties — Litchfield (Torrington), Fairfield (Bridgeport, Stamford, Danbury), and New London (New London, Norwich) — chosen to span the state's real geography from its highest hills to both ends of its coast, covering 2016 through 2025, and read the seasonal shape and regional pattern directly off the reporting rates ourselves.

Two definitions drive every regional date on this page. "Arrives" and "leaves" are the first and last of two consecutive weeks in which at least 1% of a county's checklists report the species and at least five actual checklists back that percentage — the second condition matters because a thinly-birded county can cross a percentage line on a handful of reports that a busier county never would, which manufactures regional differences that aren't real. "Reliably common" is the first week a county's reports reach 25% of that county's own peak, not a statewide one, because a hill county and a shoreline county don't share a baseline. We also checked every low-frequency species' shape before deciding what to chart: Ruby-throated's isolated single-week blips in January and November sit exactly at eBird's reporting floor and were treated as noise, while Connecticut's four rarest species — Calliope, Black-chinned, Broad-billed, and Mexican Violetear — are genuine committee-accepted birds with too few records to draw a curve, so they're described from the committee's own record history rather than charted. Because Ruby-throated's peak is roughly seventy times Rufous's, we split the two into separate charts at their own scales rather than flattening Rufous into invisibility on a shared one; with only one secondary species, that split does the whole job and no third normalized chart was needed.

The genuine finding worth calling out: Connecticut arrives as one state and leaves as three. All three counties cross the arrival threshold in the same week — the last week of April, on 71 to 127 checklists apiece — and all are reliably common a week later. But the peak marches toward the coast through the late summer: the hills peak in the third week of August at 35%, the Southeast Coast in the first week of September at 34%, and the Southwest Coast in the second week of September at 32%. Departure follows the same order, spread across three weeks. Fairfield County's late peak, arriving after the hills have already begun to empty, is consistent with birds from farther north moving through the shoreline — the data records presence, not origin, so we state that as the likely explanation rather than a measured one. The county-level comparison, the checklist-backed threshold, and this arrive-together-leave-apart pattern are original analysis on our part, not a rewrite of eBird's own bar charts.

Sources

• eBird bar chart data, Cornell Lab of Ornithology — Connecticut statewide and county-level (Litchfield, Fairfield, New London), 2016-2025. Source for all month-by-month seasonal figures and the regional arrival/departure pattern.
• Avian Records Committee of Connecticut, ARCC Review List (Connecticut Ornithological Association). Source for which hummingbird species currently require documentation in Connecticut.
• ARCC Reports Index of Species, with the committee's Tenth, Twelfth, Thirteenth, Nineteenth, and Twenty-eighth reports. Source for the dates, locations, and details of every Calliope, Black-chinned, and Rufous record cited on this page, and for Rufous's removal from the review list.
• Zenzal & Moore, "Stopover biology of Ruby-throated Hummingbirds during autumn migration", The Auk 133:237–250 (2016). Source for the pre-migration fat-load figures in the August section.

Want feeder setup, nectar ratios, and native plant picks for your part of the state? See our full guide to attracting hummingbirds in Connecticut.