Frost Dates for Townsend, MT

Based on data from Townsend 3se weather station, 4 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 19
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 19
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 25
First Fall Frost September 14

Hard Freeze (28°F)

Last Spring Hard Freeze May 7
First Fall Hard Freeze October 1
46.32°N, -111.52°W © OpenStreetMap

Growing Season

123 Days May 19 to September 19

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

10° 30° 50° 70° 90°
24°
High: 34°F
Avg: 24°F
Low: 14°F
Jan
28°
High: 39°F
Avg: 28°F
Low: 17°F
Feb
36°
High: 49°F
Avg: 36°F
Low: 24°F
Mar
45°
High: 58°F
Avg: 45°F
Low: 31°F
Apr
53°
High: 67°F
Avg: 53°F
Low: 39°F
May
60°
High: 74°F
Avg: 60°F
Low: 47°F
Jun
68°
High: 83°F
Avg: 68°F
Low: 52°F
Jul
66°
High: 83°F
Avg: 66°F
Low: 50°F
Aug
57°
High: 73°F
Avg: 57°F
Low: 42°F
Sep
45°
High: 59°F
Avg: 45°F
Low: 32°F
Oct
33°
High: 44°F
Avg: 33°F
Low: 22°F
Nov
24°
High: 34°F
Avg: 24°F
Low: 14°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" 3.0"
1.1"
1.10"
Jan
1.0"
0.98"
Feb
1.5"
1.49"
Mar
2.0"
2.00"
Apr
3.0"
2.98"
May
3.0"
3.03"
Jun
2.5"
2.50"
Jul
2.5"
2.46"
Aug
2.1"
2.10"
Sep
1.9"
1.90"
Oct
1.3"
1.28"
Nov
1.2"
1.24"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h15h15.5h15h14h12.5h10.5h9h8.5h
Jan: 7:36 AM – 4:24 PM · 8h 48m
Feb: 6:57 AM – 5:03 PM · 10h 06m
Mar: 6:12 AM – 5:48 PM · 11h 36m
Apr: 5:20 AM – 6:40 PM · 13h 20m
May: 4:37 AM – 7:23 PM · 14h 47m
Jun: 4:13 AM – 7:47 PM · 15h 34m
Jul: 4:23 AM – 7:37 PM · 15h 15m
Aug: 5:01 AM – 6:59 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 10m
Dec: 7:47 AM – 4:13 PM · 8h 25m
Daylight Longest: 15h 36m · Shortest: 8h 24m

Nearby Stations

Trident, MTMay 9 - September 27 Tizer Gardens, MT June 18 - September 5 Logan Landfill, MT May 26 - September 15 White Sulphur Springs #2, MT June 4 - September 11 Boulder, MTJune 7 - September 8 Helena Rgnl AP, MT May 9 - September 30

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