Frost Dates for Trenton A, ON

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 2
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 10
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 6
First Fall Frost October 5

Hard Freeze (−2°C)

Last Spring Hard Freeze April 19
First Fall Hard Freeze October 21
44.12°N, -77.53°W © OpenStreetMap

Growing Season

161 Days May 2 to October 10

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 5a

Avg. annual minimum: −20 to −15°F (−29 to −26°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

-15° 0° 15° 30°
-7°
High: -2°C
Avg: -7°C
Low: -12°C
Jan
-6°
High: -1°C
Avg: -6°C
Low: -11°C
Feb
-1°
High: 4°C
Avg: -1°C
Low: -6°C
Mar
6°
High: 12°C
Avg: 6°C
Low: 1°C
Apr
13°
High: 19°C
Avg: 13°C
Low: 7°C
May
18°
High: 24°C
Avg: 18°C
Low: 13°C
Jun
21°
High: 26°C
Avg: 21°C
Low: 15°C
Jul
20°
High: 26°C
Avg: 20°C
Low: 14°C
Aug
16°
High: 22°C
Avg: 16°C
Low: 10°C
Sep
9°
High: 14°C
Avg: 9°C
Low: 4°C
Oct
3°
High: 7°C
Avg: 3°C
Low: -1°C
Nov
-3°
High: 1°C
Avg: -3°C
Low: -7°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
81 mm
81.3 mm
Jan
64 mm
63.5 mm
Feb
69 mm
68.6 mm
Mar
81 mm
81.3 mm
Apr
79 mm
78.7 mm
May
94 mm
94.0 mm
Jun
71 mm
71.1 mm
Jul
71 mm
71.1 mm
Aug
91 mm
91.4 mm
Sep
86 mm
86.4 mm
Oct
89 mm
88.9 mm
Nov
76 mm
76.2 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13h14.5h15.5h15h14h12.5h10.5h9.5h8.5h
Jan: 7:29 AM – 4:31 PM · 9h 03m
Feb: 6:53 AM – 5:07 PM · 10h 14m
Mar: 6:11 AM – 5:49 PM · 11h 38m
Apr: 5:23 AM – 6:37 PM · 13h 14m
May: 4:43 AM – 7:17 PM · 14h 34m
Jun: 4:21 AM – 7:39 PM · 15h 18m
Jul: 4:30 AM – 7:30 PM · 14h 60m
Aug: 5:05 AM – 6:55 PM · 13h 50m
Sep: 5:51 AM – 6:09 PM · 12h 17m
Oct: 6:38 AM – 5:22 PM · 10h 44m
Nov: 7:19 AM – 4:41 PM · 9h 23m
Dec: 7:39 AM – 4:21 PM · 8h 42m
Daylight Longest: 15h 19m · Shortest: 8h 41m

Nearby Stations

Belleville, ON April 25 - October 15 Wooler, ONMay 6 - September 30 Mountainview, ONMay 1 - October 9 Point Petre (Aut), ON April 26 - October 25 Cobourg (Aut), ON April 27 - October 21 Cobourg Stp, ONMay 4 - October 13

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