Frost Dates for ByWard Market, ON

Based on data from Ottawa Cda weather station, 3 miles away

Elevation: 66 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 30
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 9
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 4
First Fall Frost October 4

Hard Freeze (−2°C)

Last Spring Hard Freeze April 16
First Fall Hard Freeze October 24
45.43°N, -75.69°W © OpenStreetMap

Growing Season

162 Days April 30 to October 9

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°
-10°
High: -5°C
Avg: -10°C
Low: -14°C
Jan
-8°
High: -3°C
Avg: -8°C
Low: -13°C
Feb
-2°
High: 3°C
Avg: -2°C
Low: -7°C
Mar
6°
High: 11°C
Avg: 6°C
Low: 1°C
Apr
14°
High: 20°C
Avg: 14°C
Low: 8°C
May
19°
High: 24°C
Avg: 19°C
Low: 14°C
Jun
21°
High: 27°C
Avg: 21°C
Low: 16°C
Jul
20°
High: 26°C
Avg: 20°C
Low: 15°C
Aug
16°
High: 21°C
Avg: 16°C
Low: 11°C
Sep
9°
High: 13°C
Avg: 9°C
Low: 5°C
Oct
2°
High: 6°C
Avg: 2°C
Low: -2°C
Nov
-5°
High: -2°C
Avg: -5°C
Low: -9°C
Dec
0°C
−2°C
Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)

Precipitation

0 mm 50 mm 100 mm
69 mm
68.6 mm
Jan
51 mm
50.8 mm
Feb
66 mm
66.0 mm
Mar
84 mm
83.8 mm
Apr
81 mm
81.3 mm
May
104 mm
104.1 mm
Jun
94 mm
94.0 mm
Jul
86 mm
86.4 mm
Aug
97 mm
96.5 mm
Sep
89 mm
88.9 mm
Oct
74 mm
73.7 mm
Nov
76 mm
76.2 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9.5h8.5h
Jan: 7:45 AM – 4:39 PM · 8h 54m
Feb: 7:13 AM – 5:22 PM · 10h 09m
Mar: 7:24 AM – 7:01 PM · 11h 37m
Apr: 6:24 AM – 7:42 PM · 13h 17m
May: 5:38 AM – 8:20 PM · 14h 41m
Jun: 5:19 AM – 8:47 PM · 15h 27m
Jul: 5:34 AM – 8:43 PM · 15h 08m
Aug: 6:09 AM – 8:05 PM · 13h 55m
Sep: 6:48 AM – 7:06 PM · 12h 18m
Oct: 7:27 AM – 6:09 PM · 10h 41m
Nov: 7:10 AM – 4:26 PM · 9h 15m
Dec: 7:42 AM – 4:15 PM · 8h 33m
Daylight Eastern Time (ET) Longest: 15h 29m · Shortest: 8h 31m

Nearby Stations

Ottawa Cda Rcs, ON May 1 - October 13 Ottawa Macdonald-Cartier Int'L, ON April 29 - October 7 Chelsea, QCMay 8 - October 4 Angers, QCMay 24 - September 22 Russell, ONMay 6 - October 2 Luskville, QC May 18 - September 22

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