Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 06611 — Trumbull, CT

ZIP code 06611 (Trumbull, Connecticut Metropolitan County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 25 and the first fall frost October 17.

Where ZIP 06611 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 25
First frostOct 17
2012 zone6b

Was 6b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Trumbull, CT…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Trumbull, CT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 25median — 50% chance of a later frost
Safe for tender plantsMay 10only 10% chance of frost after
First fall frostOctober 17median — 10% chance by Oct 4
Growing season175 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 10 and returns around October 30.

From the NOAA station Ansonia 1 Ne, CT — 8 miles away, elevation 138 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 06611

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 14 – Mar 28
SpinachSow outdoors · Mar 14 – Apr 4
Broccoli, cabbageStart indoors · Feb 14 – Feb 28
Broccoli, cabbageTransplant · Apr 4 – Apr 18
Onion setsPlant outdoors · Mar 28 – Apr 11
PotatoesPlant outdoors · Apr 4 – Apr 18
LettuceSow outdoors · Mar 28 – Apr 11
Carrots, beetsSow outdoors · Apr 4 – Apr 18
TomatoesStart indoors · Feb 28 – Mar 14
TomatoesTransplant · May 2 – May 16
Peppers, eggplantStart indoors · Feb 14 – Feb 28
Peppers, eggplantTransplant · May 9 – May 23
BeansSow outdoors · May 2 – May 16
Sweet cornSow outdoors · May 2 – May 16
Cucumbers, squashSow outdoors · May 2 – May 16
Fall lettuce, spinachSow outdoors · Aug 22 – Sep 5
GarlicPlant cloves · Oct 3 – Nov 7
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 25) and first fall frost (Oct 17) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 06611 came on Apr 3 — 4 days earlier than the 1991–2020 average (Apr 7).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 7a in Connecticut

546 plants native to the lower 48 states, recorded in Connecticut, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 65

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 106

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 191

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 157

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °FAtlantic mannagrass3 ft · blooms summer · low shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °F

Vines 10

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Fheartleaf peppervine2 ft · blooms late spring · low shade tolerance · to −8 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Trumbull, CT.

Soil in Trumbull, CT

The soil mapped at the center of ZIP 06611 is Charlton — moderately decomposed plant material, well drained.

TextureModerately decomposed plant materialtop layer
DrainageWell drainednatural drainage class
Organic matter95%high
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Charlton-Chatfield complex, 0 to 15 percent slopes, very rocky.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 06611; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Trumbull, CT

Summer high82 °Faverage high, July
Winter low18 °Faverage low, January
Hot days10days a year at 90 °F or more
Freezing nights130nights a year at 32 °F or less
Growing degree days2,823base 50 °F — the season’s usable heat
Longest day15 h 09 mindaylight on June 21
Shortest day9 h 11 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation51 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 36 °F, low 18 °F 36°18° JanFebruary: average high 38 °F, low 19 °F 38°19° FebMarch: average high 47 °F, low 27 °F 47°27° MarApril: average high 58 °F, low 38 °F 58°38° AprMay: average high 69 °F, low 47 °F 69°47° MayJune: average high 77 °F, low 58 °F 77°58° JunJuly: average high 82 °F, low 63 °F 82°63° JulAugust: average high 82 °F, low 62 °F 82°62° AugSeptember: average high 75 °F, low 54 °F 75°54° SepOctober: average high 63 °F, low 41 °F 63°41° OctNovember: average high 52 °F, low 32 °F 52°32° NovDecember: average high 41 °F, low 23 °F 41°23° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 3.88 in precipitation 3.9 JanFebruary: 3.25 in precipitation 3.3 FebMarch: 4.36 in precipitation 4.4 MarApril: 4.43 in precipitation 4.4 AprMay: 4.49 in precipitation 4.5 MayJune: 4.15 in precipitation 4.2 JunJuly: 4.21 in precipitation 4.2 JulAugust: 4.12 in precipitation 4.1 AugSeptember: 4.49 in precipitation 4.5 SepOctober: 5.20 in precipitation 5.2 OctNovember: 3.97 in precipitation 4.0 NovDecember: 4.45 in precipitation 4.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ansonia 1 Ne, CT (8 mi away); precipitation: Shelton 1.3 W, CT (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

3 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

066067a
Bridgeport, CT · 4 mi
064846b
Shelton, CT · 4 mi
064686b
Monroe, CT · 5 mi
066126b
Easton, CT · 5 mi
066107a
Bridgeport, CT · 5 mi
066147a
Stratford, CT · 5 mi
068257a
Fairfield, CT · 6 mi
066087a
Bridgeport, CT · 6 mi

Connecticut planting zones →

Questions about 06611

What planting zone is ZIP code 06611?

ZIP code 06611 (Trumbull, CT) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Trumbull, CT?

The median last spring frost (32 °F) near 06611 is April 25; after May 10 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ansonia 1 Ne station.

When is the first frost in Trumbull, CT?

The median first fall frost near 06611 is October 17, giving a median frost-free growing season of 175 days.

When should I plant tomatoes in 06611?

Start tomato seeds indoors around Feb 28 – Mar 14 and set transplants outside around May 2 – May 16, one to three weeks after the median last frost.

How much rain and snow does 06611 get?

About 51 inches of precipitation a year (NOAA 1991–2020 normals, Shelton 1.3 W station).

How hot do summers get in Trumbull, CT?

The average high peaks at 82 °F in July, with about 10 days a year at 90 °F or more.

What kind of soil does 06611 have?

The USDA soil survey maps Charlton at the center of ZIP 06611: moderately decomposed plant material, well drained.

Did spring come early in Trumbull, CT in 2026?

Spring leaf-out near 06611 came on Apr 3 in 2026, 4 days earlier than the 1991–2020 average (Apr 7), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Trumbull, CT?

Long-day onions: the longest day near 06611 is 15 h 09 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 06611 change?

Yes. The 2012 USDA map put 06611 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.