Frost Dates for Butte, MT

Based on data from Butte Bert Mooney AP weather station, 3 miles away

Elevation: 5538 ft

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 13
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 21
First Fall Frost August 31

Hard Freeze (28°F)

Last Spring Hard Freeze May 21
First Fall Hard Freeze September 17
46.00°N, -112.53°W © OpenStreetMap

Growing Season

84 Days June 13 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 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.

BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

Köppen climate map

Temperature

0° 30° 60° 90°
20°
High: 32°F
Avg: 20°F
Low: 8°F
Jan
22°
High: 35°F
Avg: 22°F
Low: 10°F
Feb
32°
High: 44°F
Avg: 32°F
Low: 19°F
Mar
39°
High: 51°F
Avg: 39°F
Low: 26°F
Apr
48°
High: 61°F
Avg: 48°F
Low: 34°F
May
56°
High: 70°F
Avg: 56°F
Low: 41°F
Jun
64°
High: 81°F
Avg: 64°F
Low: 46°F
Jul
62°
High: 80°F
Avg: 62°F
Low: 44°F
Aug
53°
High: 69°F
Avg: 53°F
Low: 37°F
Sep
41°
High: 54°F
Avg: 41°F
Low: 27°F
Oct
28°
High: 40°F
Avg: 28°F
Low: 16°F
Nov
19°
High: 31°F
Avg: 19°F
Low: 7°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 2.8"
0.9"
0.93"
Jan
1.0"
0.97"
Feb
1.4"
1.43"
Mar
1.9"
1.91"
Apr
2.8"
2.84"
May
2.7"
2.66"
Jun
2.2"
2.20"
Jul
2.5"
2.46"
Aug
2.3"
2.34"
Sep
1.7"
1.72"
Oct
1.2"
1.17"
Nov
0.9"
0.93"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9h8.5h
Jan: 8:14 AM – 5:04 PM · 8h 50m
Feb: 7:41 AM – 5:48 PM · 10h 07m
Mar: 7:51 AM – 7:28 PM · 11h 37m
Apr: 6:51 AM – 8:10 PM · 13h 19m
May: 6:04 AM – 8:49 PM · 14h 45m
Jun: 5:44 AM – 9:16 PM · 15h 32m
Jul: 5:59 AM – 9:12 PM · 15h 13m
Aug: 6:35 AM – 8:33 PM · 13h 58m
Sep: 7:15 AM – 7:34 PM · 12h 18m
Oct: 7:55 AM – 6:35 PM · 10h 39m
Nov: 7:39 AM – 4:51 PM · 9h 12m
Dec: 8:12 AM – 4:40 PM · 8h 28m
Daylight Mountain Time (MT) Longest: 15h 33m · Shortest: 8h 27m

Nearby Stations

Divide, MTJune 10 - September 7 Anaconda, MTJune 1 - September 14 Boulder, MTJune 7 - September 8 Wise Rvr 3 Wnw, MT Twin Bridges, MT June 8 - September 2 Glen 4 N, MT

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