Frost Dates for Delaware, ON

Based on data from Strathroy-Mullifarry weather station, 13 miles away

Elevation: 222 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. May 9
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 14
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 May 14
First Fall Frost October 9

Hard Freeze (−2°C)

Last Spring Hard Freeze April 25
First Fall Hard Freeze October 31
42.92°N, -81.42°W © OpenStreetMap

Growing Season

158 Days May 9 to October 14

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 5b

Avg. annual minimum: −15 to −10°F (−26 to −23°C)

Learn more

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

Dfb Warm-Summer Continental

Warm summers and cold, snowy winters. A shorter growing season than hot-summer continental. Hardy vegetables, root crops, and cool-season greens do well. Season extension is valuable.

Köppen climate map

Temperature

-10° 0° 10° 20° 30°
-5°
High: -1°C
Avg: -5°C
Low: -8°C
Jan
-4°
High: 0°C
Avg: -4°C
Low: -8°C
Feb
1°
High: 5°C
Avg: 1°C
Low: -4°C
Mar
7°
High: 13°C
Avg: 7°C
Low: 2°C
Apr
14°
High: 20°C
Avg: 14°C
Low: 8°C
May
19°
High: 25°C
Avg: 19°C
Low: 13°C
Jun
22°
High: 27°C
Avg: 22°C
Low: 16°C
Jul
21°
High: 26°C
Avg: 21°C
Low: 15°C
Aug
17°
High: 23°C
Avg: 17°C
Low: 11°C
Sep
11°
High: 15°C
Avg: 11°C
Low: 6°C
Oct
4°
High: 8°C
Avg: 4°C
Low: 0°C
Nov
-2°
High: 2°C
Avg: -2°C
Low: -5°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
76 mm
76.2 mm
Jan
69 mm
68.6 mm
Feb
61 mm
61.0 mm
Mar
89 mm
88.9 mm
Apr
91 mm
91.4 mm
May
89 mm
88.9 mm
Jun
79 mm
78.7 mm
Jul
79 mm
78.7 mm
Aug
94 mm
94.0 mm
Sep
94 mm
94.0 mm
Oct
99 mm
99.1 mm
Nov
79 mm
78.7 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10.5h11.5h13h14.5h15h15h14h12.5h11h9.5h9h
Jan: 8:01 AM – 5:11 PM · 9h 10m
Feb: 7:32 AM – 5:50 PM · 10h 18m
Mar: 7:47 AM – 7:26 PM · 11h 39m
Apr: 6:51 AM – 8:02 PM · 13h 11m
May: 6:09 AM – 8:37 PM · 14h 28m
Jun: 5:52 AM – 9:02 PM · 15h 09m
Jul: 6:06 AM – 8:58 PM · 14h 52m
Aug: 6:38 AM – 8:24 PM · 13h 46m
Sep: 7:13 AM – 7:29 PM · 12h 17m
Oct: 7:48 AM – 6:35 PM · 10h 47m
Nov: 7:27 AM – 4:56 PM · 9h 29m
Dec: 7:57 AM – 4:48 PM · 8h 50m
Daylight Eastern Time (ET) Longest: 15h 11m · Shortest: 8h 49m

Nearby Stations

Thedford, ONMay 9 - October 15 St Thomas Wpcp, ON May 7 - October 13 New Glasgow, ONMay 4 - October 16 Port Huron, MI April 19 - November 3 Stratford Wwtp, ON May 11 - October 11 Foldens, ONMay 2 - October 15

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