When is the last frost in Danbury, CT?

The average last spring frost (50% probability of 32°F) in Danbury is around May 1, based on NOAA/NCEI 1991–2020 normals at the Danbury Muni Ap, CT station (1.4 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 Danbury?

The average first fall frost in Danbury, CT is around October 14, giving roughly a 166-day frost-free growing season.

What planting zone is Danbury, CT?

Danbury is in USDA plant hardiness zone 6b (average annual extreme minimum temperature -5 to 0°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Danbury?

In Danbury, CT the warmest month is July (avg high 84.9°F) and the coldest is January (avg low 20.5°F). It averages about 53″ of precipitation a year and 49.3″ of snow.

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Danbury, CT Planting Calendar & Frost Dates

USDA hardiness zone 6b · ZIP 06810 · elevation 123′ · NOAA & USDA data

Danbury is in USDA hardiness zone 6b (winters can dip to -5 to 0°F), with a growing season of about 166 days between the average last spring frost (May 1) and first fall frost (October 14). The warmest month is July (avg high 84.9°F); the coldest is January (avg low 20.5°F). It averages 53″ of precipitation a year and 49.3″ of snow, mostly mid-winter. 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 -5 to 0°F

Last spring frost

May 1

avg (50% prob, 32°F)

First fall frost

October 14

avg (50% prob, 32°F)

Growing season

166 days

frost-free window

Warmest month

July

avg high 84.9°F

Month-by-month typical weather in Danbury

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Danbury, CT (2.4 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	35.5	20.5	28	3.7	15.7
February	38.8	21.9	30.3	3.3	11
March	47.7	29.1	38.4	4.4	10.4
April	60.5	39.4	49.9	4.2	1.7
May	71.5	49.3	60.4	4.2	0
June	80.1	58.7	69.4	4.8	0
July	84.9	64.1	74.5	5	0
August	82.2	62.6	72.4	4.9	0
September	74.7	54.7	64.7	4.9	0
October	62.5	43.2	52.8	5	0
November	50.4	33.9	42.2	4	1.9
December	40.1	26.2	33.2	4.6	8.6

What to plant when in Danbury

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 20 · Transplant out: May 8
Peppers	warm	Start seeds indoors: March 6 · Transplant out: May 15
Cucumbers	warm	Direct sow: May 8
Zucchini / squash	warm	Direct sow: May 8
Bush beans	warm	Direct sow: May 8
Sweet corn	warm	Direct sow: May 8
Basil	warm	Transplant out: May 8
Peas	cool	Sow (spring): March 27 · Sow (fall): August 19
Spinach	cool	Sow (spring): March 20 · Sow (fall): August 19
Lettuce	cool	Sow (spring): April 3 · Sow (fall): August 19
Kale	cool	Transplant (spring): April 10 · Sow (fall): August 5
Broccoli	cool	Transplant (spring): April 17
Carrots	cool	Sow (spring): April 10 · Sow (fall): August 5
Onions	cool	Transplant (spring): April 3
Potatoes	cool	Plant seed potatoes: April 17
Radishes	cool	Sow (spring): April 3 · Sow (fall): September 2

Dates are computed from Danbury'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.

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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

Shelton, CT Norwalk, CT Bridgeport, CT Stamford, CT Milford, CT Waterbury, CT West Haven, CT New Haven, 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 — Danbury Muni Ap, CT, 1.4 mi (confidence: high). Monthly weather normals: Danbury, CT, 2.4 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.