Frost Dates for Norwalk, CT

Based on data from Stamford 5 N weather station, 7 miles away

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. April 17
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 23
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.

Last Spring Frost April 23
First Fall Frost October 16

Hard Freeze (28°F)

Last Spring Hard Freeze April 3
First Fall Hard Freeze November 2
41.12°N, -73.41°W © OpenStreetMap

Growing Season

189 Days April 17 to October 23

USDA Hardiness Zone iHardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.

Zone 6b

Avg. annual minimum: −5 to 0°F (−21 to −18°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Dfa Hot-Summer Continental

Hot summers and cold winters with year-round precipitation. Moderate growing season supports warm-season crops like tomatoes, peppers, and corn. Winter protection extends the harvest.

Köppen climate map

Temperature

20° 40° 60° 80°
30°
High: 38°F
Avg: 30°F
Low: 22°F
Jan
32°
High: 41°F
Avg: 32°F
Low: 23°F
Feb
40°
High: 49°F
Avg: 40°F
Low: 30°F
Mar
51°
High: 62°F
Avg: 51°F
Low: 40°F
Apr
61°
High: 72°F
Avg: 61°F
Low: 50°F
May
69°
High: 80°F
Avg: 69°F
Low: 59°F
Jun
75°
High: 85°F
Avg: 75°F
Low: 64°F
Jul
73°
High: 83°F
Avg: 73°F
Low: 63°F
Aug
66°
High: 76°F
Avg: 66°F
Low: 56°F
Sep
55°
High: 64°F
Avg: 55°F
Low: 45°F
Oct
44°
High: 53°F
Avg: 44°F
Low: 35°F
Nov
35°
High: 43°F
Avg: 35°F
Low: 27°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 2" 4" 6" 7.0"
5.3"
5.35"
Jan
5.5"
5.50"
Feb
7.0"
7.01"
Mar
6.1"
6.06"
Apr
5.0"
5.04"
May
4.6"
4.64"
Jun
6.3"
6.34"
Jul
6.8"
6.83"
Aug
7.0"
6.95"
Sep
5.4"
5.40"
Oct
5.2"
5.22"
Nov
6.0"
6.04"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14.5h15h14.5h13.5h12.5h11h9.5h9h
Jan: 7:19 AM – 4:41 PM · 9h 21m
Feb: 6:48 AM – 5:12 PM · 10h 25m
Mar: 6:10 AM – 5:50 PM · 11h 40m
Apr: 5:27 AM – 6:33 PM · 13h 07m
May: 4:51 AM – 7:09 PM · 14h 18m
Jun: 4:32 AM – 7:28 PM · 14h 57m
Jul: 4:39 AM – 7:21 PM · 14h 41m
Aug: 5:11 AM – 6:49 PM · 13h 39m
Sep: 5:52 AM – 6:08 PM · 12h 15m
Oct: 6:34 AM – 5:26 PM · 10h 52m
Nov: 7:11 AM – 4:49 PM · 9h 39m
Dec: 7:29 AM – 4:31 PM · 9h 03m
Daylight Longest: 14h 58m · Shortest: 9h 02m

Nearby Stations

Westchester Co AP, NY April 12 - October 31 Yorktown Hts 1w, NY April 25 - October 19 Dobbs Ferry-Ardsley, NY April 20 - October 26 Danbury Muni AP, CT May 1 - October 14 Centerport, NY April 9 - November 10 Danbury, CTApril 20 - October 20

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