Frost Dates for Grand Marais, MN

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 20
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 5
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 27
First Fall Frost September 29

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze May 4
First Fall Hard Freeze October 17
47.75°N, -90.33°W © OpenStreetMap

Growing Season

138 Days May 20 to October 5

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 4b

Learn more

Temperature

0° 20° 40° 60°
14°
High: 21°
Avg: 14°
Low: 6°
Jan
16°
High: 25°
Avg: 16°
Low: 8°
Feb
26°
High: 33°
Avg: 26°
Low: 18°
Mar
36°
High: 44°
Avg: 36°
Low: 29°
Apr
45°
High: 53°
Avg: 45°
Low: 37°
May
53°
High: 61°
Avg: 53°
Low: 44°
Jun
60°
High: 69°
Avg: 60°
Low: 52°
Jul
62°
High: 70°
Avg: 62°
Low: 54°
Aug
55°
High: 62°
Avg: 55°
Low: 47°
Sep
43°
High: 50°
Avg: 43°
Low: 36°
Oct
31°
High: 37°
Avg: 31°
Low: 24°
Nov
19°
High: 26°
Avg: 19°
Low: 13°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 2" 4" 5.4"
2.6"
2.56"
Jan
2.2"
2.20"
Feb
3.1"
3.10"
Mar
4.9"
4.91"
Apr
5.4"
5.37"
May
4.8"
4.82"
Jun
4.9"
4.93"
Jul
4.9"
4.90"
Aug
4.6"
4.60"
Sep
4.6"
4.59"
Oct
3.7"
3.70"
Nov
3.1"
3.13"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h15h16h15h14h12h11h9h8h
Jan: 7:42 AM – 4:18 PM · 8h 37m
Feb: 7:00 AM – 4:60 PM · 9h 59m
Mar: 6:12 AM – 5:48 PM · 11h 35m
Apr: 5:18 AM – 6:42 PM · 13h 24m
May: 4:32 AM – 7:28 PM · 14h 56m
Jun: 4:07 AM – 7:53 PM · 15h 47m
Jul: 4:17 AM – 7:43 PM · 15h 26m
Aug: 4:57 AM – 7:03 PM · 14h 05m
Sep: 5:50 AM – 6:10 PM · 12h 20m
Oct: 6:43 AM – 5:17 PM · 10h 34m
Nov: 7:30 AM – 4:30 PM · 9h 00m
Dec: 7:53 AM – 4:07 PM · 8h 13m
Daylight Longest: 15h 48m · Shortest: 8h 12m

Nearby Stations

Grand Marais, MN May 22 - October 9 Lutsen 3nne, MN May 26 - September 27 Grand Portage, MN May 24 - September 29 Gunflint Lake 10 Nw, MN May 23 - September 26 Wolf Ridge Elc, MN May 15 - October 1 Flint, CanadaJune 13 - August 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