Frost Dates for Glasgow Intl AP, MT

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 6
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 30
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 11
First Fall Frost September 25

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze April 26
First Fall Hard Freeze October 9
48.21°N, -106.62°W © OpenStreetMap

Growing Season

147 Days May 6 to September 30

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

Learn more

Temperature

0° 30° 60° 90°
15°
High: 24°
Avg: 15°
Low: 6°
Jan
19°
High: 28°
Avg: 19°
Low: 9°
Feb
32°
High: 42°
Avg: 32°
Low: 21°
Mar
45°
High: 57°
Avg: 45°
Low: 33°
Apr
56°
High: 68°
Avg: 56°
Low: 43°
May
65°
High: 76°
Avg: 65°
Low: 53°
Jun
72°
High: 86°
Avg: 72°
Low: 59°
Jul
71°
High: 85°
Avg: 71°
Low: 57°
Aug
60°
High: 73°
Avg: 60°
Low: 47°
Sep
45°
High: 57°
Avg: 45°
Low: 34°
Oct
30°
High: 40°
Avg: 30°
Low: 21°
Nov
18°
High: 27°
Avg: 18°
Low: 10°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 3" 3.0"
0.9"
0.93"
Jan
0.8"
0.84"
Feb
1.3"
1.31"
Mar
2.1"
2.09"
Apr
2.8"
2.76"
May
3.0"
3.04"
Jun
2.7"
2.66"
Jul
2.5"
2.45"
Aug
2.1"
2.13"
Sep
1.7"
1.74"
Oct
1.1"
1.09"
Nov
0.9"
0.93"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h15h16h15h14h12h11h9h8h
Jan: 7:43 AM – 4:17 PM · 8h 33m
Feb: 7:01 AM – 4:59 PM · 9h 57m
Mar: 6:13 AM – 5:47 PM · 11h 35m
Apr: 5:17 AM – 6:43 PM · 13h 26m
May: 4:30 AM – 7:30 PM · 14h 59m
Jun: 4:05 AM – 7:55 PM · 15h 51m
Jul: 4:15 AM – 7:45 PM · 15h 29m
Aug: 4:56 AM – 7:04 PM · 14h 07m
Sep: 5:50 AM – 6:10 PM · 12h 20m
Oct: 6:44 AM – 5:16 PM · 10h 33m
Nov: 7:31 AM – 4:29 PM · 8h 57m
Dec: 7:55 AM – 4:05 PM · 8h 09m
Daylight Longest: 15h 52m · Shortest: 8h 08m

Nearby Stations

Glasgow #2, MTMay 3 - October 1 Nashua #2, MT May 12 - September 24 St Marie, MTMay 13 - September 27 Ft Peck Pwr Plt, MT May 8 - October 1 Hinsdale 4 Sw, MT May 15 - September 26 Opheim 12 Sse, MT June 5 - September 2

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