Frost Dates for Tizer Gardens, 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. June 18
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 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 June 24
First Fall Frost August 30

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze May 29
First Fall Hard Freeze September 18
46.37°N, -112.02°W © OpenStreetMap

Growing Season

79 Days June 18 to September 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 5a

Learn more

Temperature

10° 30° 50° 70° 90°
23°
High: 35°
Avg: 23°
Low: 10°
Jan
24°
High: 36°
Avg: 24°
Low: 11°
Feb
32°
High: 46°
Avg: 32°
Low: 18°
Mar
40°
High: 54°
Avg: 40°
Low: 25°
Apr
47°
High: 62°
Avg: 47°
Low: 33°
May
55°
High: 71°
Avg: 55°
Low: 39°
Jun
63°
High: 81°
Avg: 63°
Low: 44°
Jul
62°
High: 82°
Avg: 62°
Low: 43°
Aug
53°
High: 71°
Avg: 53°
Low: 35°
Sep
41°
High: 56°
Avg: 41°
Low: 26°
Oct
31°
High: 43°
Avg: 31°
Low: 19°
Nov
22°
High: 33°
Avg: 22°
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" 3.3"
0.9"
0.93"
Jan
0.8"
0.84"
Feb
1.3"
1.30"
Mar
1.5"
1.54"
Apr
2.3"
2.32"
May
3.0"
3.03"
Jun
3.3"
3.31"
Jul
2.8"
2.84"
Aug
2.2"
2.17"
Sep
1.9"
1.86"
Oct
1.4"
1.42"
Nov
0.9"
0.93"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h15h16h15h14h12h11h9h8h
Jan: 7:36 AM – 4:24 PM · 8h 47m
Feb: 6:57 AM – 5:03 PM · 10h 05m
Mar: 6:12 AM – 5:48 PM · 11h 36m
Apr: 5:20 AM – 6:40 PM · 13h 20m
May: 4:36 AM – 7:24 PM · 14h 47m
Jun: 4:12 AM – 7:48 PM · 15h 35m
Jul: 4:22 AM – 7:38 PM · 15h 15m
Aug: 5:00 AM – 6:60 PM · 13h 59m
Sep: 5:51 AM – 6:09 PM · 12h 19m
Oct: 6:41 AM – 5:19 PM · 10h 38m
Nov: 7:25 AM – 4:35 PM · 9h 09m
Dec: 7:48 AM – 4:12 PM · 8h 25m
Daylight Longest: 15h 37m · Shortest: 8h 23m

Nearby Stations

Boulder, MTJune 7 - September 8 Helena Rgnl AP, MT May 9 - September 30 Austin 1 W, MT June 4 - September 14 Elliston, MTJune 9 - September 8 Townsend 3se, MT May 19 - September 19 Butte Bert Mooney AP, MT June 13 - September 5

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