Frost Dates for Chatham, ON

Based on data from Erieau (Aut) weather station, 18 miles away

Elevation: 183 m

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 13
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. November 11
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 18
First Fall Frost November 3

Hard Freeze (−2°C)

Last Spring Hard Freeze April 1
First Fall Hard Freeze November 23
42.41°N, -82.18°W © OpenStreetMap

Growing Season

212 Days April 13 to November 11

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 7a

Avg. annual minimum: 0 to 5°F (−18 to −15°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

-10° 0° 10° 20°
-4°
High: -1°C
Avg: -4°C
Low: -6°C
Jan
-3°
High: 0°C
Avg: -3°C
Low: -6°C
Feb
0°
High: 3°C
Avg: 0°C
Low: -2°C
Mar
6°
High: 9°C
Avg: 6°C
Low: 3°C
Apr
12°
High: 15°C
Avg: 12°C
Low: 9°C
May
18°
High: 21°C
Avg: 18°C
Low: 16°C
Jun
21°
High: 24°C
Avg: 21°C
Low: 19°C
Jul
22°
High: 24°C
Avg: 22°C
Low: 19°C
Aug
18°
High: 21°C
Avg: 18°C
Low: 15°C
Sep
12°
High: 15°C
Avg: 12°C
Low: 9°C
Oct
6°
High: 8°C
Avg: 6°C
Low: 3°C
Nov
0°
High: 2°C
Avg: 0°C
Low: -3°C
Dec
0°C
−2°C
Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)

Precipitation

0 mm 30 mm 60 mm 90 mm
0 mm
0.0 mm
Jan
0 mm
0.0 mm
Feb
0 mm
0.0 mm
Mar
0 mm
0.0 mm
Apr
58 mm
58.4 mm
May
81 mm
81.3 mm
Jun
79 mm
78.7 mm
Jul
48 mm
48.3 mm
Aug
79 mm
78.7 mm
Sep
0 mm
0.0 mm
Oct
0 mm
0.0 mm
Nov
0 mm
0.0 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10.5h11.5h13h14.5h15h15h13.5h12.5h11h9.5h9h
Jan: 7:60 AM – 5:14 PM · 9h 14m
Feb: 7:32 AM – 5:53 PM · 10h 21m
Mar: 7:48 AM – 7:27 PM · 11h 39m
Apr: 6:53 AM – 8:02 PM · 13h 09m
May: 6:12 AM – 8:36 PM · 14h 24m
Jun: 5:56 AM – 8:60 PM · 15h 04m
Jul: 6:09 AM – 8:57 PM · 14h 48m
Aug: 6:40 AM – 8:23 PM · 13h 43m
Sep: 7:14 AM – 7:30 PM · 12h 16m
Oct: 7:48 AM – 6:37 PM · 10h 49m
Nov: 7:26 AM – 4:59 PM · 9h 33m
Dec: 7:56 AM – 4:51 PM · 8h 55m
Daylight Eastern Time (ET) Longest: 15h 06m · Shortest: 8h 54m

Nearby Stations

New Glasgow, ONMay 4 - October 16 Algonac Wwtp, MI May 3 - October 18 Kingsville Moe, ON April 20 - October 29 Painesville 4 Nw, OH April 15 - November 9 St Thomas Wpcp, ON May 7 - October 13 Grosse Pointe Farms, MI April 29 - October 22

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