Frost Dates for Miles City, MT

Based on data from Miles City F Wiley Fld weather station, 2 miles away

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 8
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 13
First Fall Frost September 26

Hard Freeze (28°F)

Last Spring Hard Freeze April 29
First Fall Hard Freeze October 8
46.41°N, -105.84°W © OpenStreetMap

Growing Season

145 Days May 8 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 4b

Avg. annual minimum: −25 to −20°F (−32 to −29°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: 30°F
Avg: 20°F
Low: 9°F
Jan
24°
High: 35°F
Avg: 24°F
Low: 13°F
Feb
35°
High: 47°F
Avg: 35°F
Low: 23°F
Mar
46°
High: 58°F
Avg: 46°F
Low: 33°F
Apr
56°
High: 68°F
Avg: 56°F
Low: 43°F
May
66°
High: 79°F
Avg: 66°F
Low: 53°F
Jun
74°
High: 89°F
Avg: 74°F
Low: 60°F
Jul
73°
High: 87°F
Avg: 73°F
Low: 58°F
Aug
61°
High: 76°F
Avg: 61°F
Low: 47°F
Sep
46°
High: 59°F
Avg: 46°F
Low: 34°F
Oct
33°
High: 44°F
Avg: 33°F
Low: 21°F
Nov
22°
High: 33°F
Avg: 22°F
Low: 12°F
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
1.5"
1.46"
Mar
1.9"
1.95"
Apr
3.1"
3.07"
May
3.3"
3.29"
Jun
2.7"
2.70"
Jul
1.9"
1.92"
Aug
1.8"
1.80"
Sep
1.5"
1.51"
Oct
1.0"
1.00"
Nov
0.9"
0.93"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h15h15.5h15.5h14h12.5h10.5h9h8.5h
Jan: 7:37 AM – 4:23 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 48m
Jun: 4:12 AM – 7:48 PM · 15h 35m
Jul: 4:22 AM – 7:38 PM · 15h 16m
Aug: 5:00 AM – 6:60 PM · 13h 60m
Sep: 5:51 AM – 6:09 PM · 12h 19m
Oct: 6:41 AM – 5:19 PM · 10h 38m
Nov: 7:26 AM – 4:34 PM · 9h 09m
Dec: 7:48 AM – 4:12 PM · 8h 24m
Daylight Longest: 15h 37m · Shortest: 8h 23m

Nearby Stations

Mizpah 4 Nnw, MT May 22 - September 15 Rock Springs, MT May 15 - September 25 Terry, MTMay 12 - September 28 Forsyth, MTMay 9 - September 29 Brandenberg, MT May 18 - September 22 Terry 21 Nnw, MT May 26 - September 17

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