Frost Dates for Portage Southport, MB

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 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. September 25
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 24
First Fall Frost September 16

Hard Freeze (−2°C)

Last Spring Hard Freeze May 5
First Fall Hard Freeze October 10
49.90°N, -98.28°W © OpenStreetMap

Growing Season

131 Days May 17 to September 25

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 4a

Avg. annual minimum: −30 to −25°F (−34 to −32°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

-20° -5° 10° 25°
-15°
High: -10°C
Avg: -15°C
Low: -19°C
Jan
-13°
High: -8°C
Avg: -13°C
Low: -18°C
Feb
-5°
High: -1°C
Avg: -5°C
Low: -10°C
Mar
4°
High: 10°C
Avg: 4°C
Low: -2°C
Apr
11°
High: 17°C
Avg: 11°C
Low: 5°C
May
17°
High: 22°C
Avg: 17°C
Low: 11°C
Jun
20°
High: 25°C
Avg: 20°C
Low: 14°C
Jul
19°
High: 25°C
Avg: 19°C
Low: 13°C
Aug
13°
High: 19°C
Avg: 13°C
Low: 8°C
Sep
6°
High: 10°C
Avg: 6°C
Low: 1°C
Oct
-3°
High: 1°C
Avg: -3°C
Low: -8°C
Nov
-11°
High: -7°C
Avg: -11°C
Low: -16°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
8 mm
7.6 mm
Feb
18 mm
17.8 mm
Mar
33 mm
33.0 mm
Apr
71 mm
71.1 mm
May
86 mm
86.4 mm
Jun
71 mm
71.1 mm
Jul
51 mm
50.8 mm
Aug
46 mm
45.7 mm
Sep
30 mm
30.5 mm
Oct
10 mm
10.2 mm
Nov
3 mm
2.5 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec8.5h10h11.5h13.5h15h16h15.5h14.5h12.5h10.5h9h8h
Jan: 7:50 AM – 4:10 PM · 8h 20m
Feb: 7:05 AM – 4:55 PM · 9h 50m
Mar: 6:13 AM – 5:47 PM · 11h 33m
Apr: 5:15 AM – 6:45 PM · 13h 31m
May: 4:25 AM – 7:35 PM · 15h 11m
Jun: 3:57 AM – 8:03 PM · 16h 06m
Jul: 4:08 AM – 7:52 PM · 15h 43m
Aug: 4:52 AM – 7:08 PM · 14h 15m
Sep: 5:49 AM – 6:11 PM · 12h 21m
Oct: 6:46 AM – 5:14 PM · 10h 27m
Nov: 7:37 AM – 4:23 PM · 8h 45m
Dec: 8:03 AM – 3:57 PM · 7h 53m
Daylight Longest: 16h 08m · Shortest: 7h 52m

Nearby Stations

Delta Marsh Cs, MB May 16 - September 19 Marquette, MB May 17 - September 28 Carman U Of M Cs, MB May 20 - September 23 Miami Thiessen, MB May 14 - September 24 Carman, MBMay 18 - September 20 Deerwood Rcs, MB May 18 - September 25

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview