When is the last frost in West Haven, CT?

The average last spring frost (50% probability of 32°F) in West Haven is around April 17, based on NOAA/NCEI 1991–2020 normals at the New Haven Tweed Ap, CT station (4.1 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in West Haven?

The average first fall frost in West Haven, CT is around October 27, giving roughly a 193-day frost-free growing season.

What planting zone is West Haven, CT?

West Haven is in USDA plant hardiness zone 7a (average annual extreme minimum temperature 0 to 5°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in West Haven?

In West Haven, CT the warmest month is July (avg high 82.1°F) and the coldest is January (avg low 23°F). It averages about 41.8″ of precipitation a year.

Home › Connecticut › West Haven

West Haven, CT Planting Calendar & Frost Dates

USDA hardiness zone 7a · ZIP 06516 · elevation 1′ · NOAA & USDA data

West Haven is in USDA hardiness zone 7a (winters can dip to 0 to 5°F), with a growing season of about 193 days between the average last spring frost (April 17) and first fall frost (October 27). The warmest month is July (avg high 82.1°F); the coldest is January (avg low 23°F). It averages 41.8″ of precipitation a year. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 0 to 5°F

Last spring frost

April 17

avg (50% prob, 32°F)

First fall frost

October 27

avg (50% prob, 32°F)

Growing season

193 days

frost-free window

Warmest month

July

avg high 82.1°F

Month-by-month typical weather in West Haven

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at New Haven Tweed Ap, CT (4.1 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	38.1	23	30.5	2.7	–
February	40.2	23.9	32	2.8	–
March	47	30.1	38.5	3.7	–
April	57.8	39.3	48.5	4.2	–
May	67.7	49.4	58.5	3.5	–
June	76.4	59.3	67.9	3.5	–
July	82.1	65.7	73.9	3.4	–
August	81	64.7	72.9	3.6	–
September	74.7	57.3	66	4	–
October	63.8	45.5	54.7	3.8	–
November	53.4	35.9	44.7	3.1	–
December	43.7	28.9	36.3	3.5	–

What to plant when in West Haven

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 6 · Transplant out: April 24
Peppers	warm	Start seeds indoors: February 20 · Transplant out: May 1
Cucumbers	warm	Direct sow: April 24
Zucchini / squash	warm	Direct sow: April 24
Bush beans	warm	Direct sow: April 24
Sweet corn	warm	Direct sow: April 24
Basil	warm	Transplant out: April 24
Peas	cool	Sow (spring): March 13 · Sow (fall): September 1
Spinach	cool	Sow (spring): March 6 · Sow (fall): September 1
Lettuce	cool	Sow (spring): March 20 · Sow (fall): September 1
Kale	cool	Transplant (spring): March 27 · Sow (fall): August 18
Broccoli	cool	Transplant (spring): April 3
Carrots	cool	Sow (spring): March 27 · Sow (fall): August 18
Onions	cool	Transplant (spring): March 20
Potatoes	cool	Plant seed potatoes: April 3
Radishes	cool	Sow (spring): March 20 · Sow (fall): September 15

Dates are computed from West Haven's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

Want the exact dates for your yard? →
Look up your precise ZIP-code frost dates and a full 26-crop planting calendar on our free interactive tool.
Open the frost & planting tool

🌾 Get a frost reminder

One email in early spring and early fall with the dates for your area. No spam.

Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in Connecticut

New Haven, CT Milford, CT Shelton, CT Bridgeport, CT Waterbury, CT Meriden, CT Middletown, CT Danbury, CT

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — New Haven Tweed Ap, CT, 4.1 mi (confidence: high). Monthly weather normals: New Haven Tweed Ap, CT, 4.1 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.