Frost Dates for Manhattan, MT

Based on data from Logan Landfill 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 26
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 15
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 1
First Fall Frost September 9

Hard Freeze (28°F)

Last Spring Hard Freeze May 11
First Fall Hard Freeze September 27
45.86°N, -111.33°W © OpenStreetMap

Growing Season

112 Days May 26 to September 15

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

Avg. annual minimum: −20 to −15°F (−29 to −26°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°
21°
High: 33°F
Avg: 21°F
Low: 10°F
Jan
25°
High: 37°F
Avg: 25°F
Low: 13°F
Feb
33°
High: 46°F
Avg: 33°F
Low: 21°F
Mar
42°
High: 55°F
Avg: 42°F
Low: 29°F
Apr
50°
High: 64°F
Avg: 50°F
Low: 36°F
May
58°
High: 73°F
Avg: 58°F
Low: 44°F
Jun
67°
High: 85°F
Avg: 67°F
Low: 49°F
Jul
65°
High: 83°F
Avg: 65°F
Low: 46°F
Aug
56°
High: 73°F
Avg: 56°F
Low: 39°F
Sep
43°
High: 58°F
Avg: 43°F
Low: 28°F
Oct
30°
High: 42°F
Avg: 30°F
Low: 19°F
Nov
22°
High: 32°F
Avg: 22°F
Low: 11°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" 3.6"
1.6"
1.60"
Jan
1.3"
1.25"
Feb
1.9"
1.92"
Mar
2.6"
2.65"
Apr
3.1"
3.14"
May
3.6"
3.63"
Jun
3.4"
3.35"
Jul
2.7"
2.69"
Aug
3.0"
2.97"
Sep
2.5"
2.51"
Oct
1.6"
1.63"
Nov
1.8"
1.79"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9h8.5h
Jan: 7:35 AM – 4:25 PM · 8h 51m
Feb: 6:56 AM – 5:04 PM · 10h 07m
Mar: 6:12 AM – 5:48 PM · 11h 37m
Apr: 5:21 AM – 6:39 PM · 13h 19m
May: 4:38 AM – 7:22 PM · 14h 44m
Jun: 4:14 AM – 7:46 PM · 15h 31m
Jul: 4:24 AM – 7:36 PM · 15h 12m
Aug: 5:01 AM – 6:59 PM · 13h 57m
Sep: 5:51 AM – 6:09 PM · 12h 18m
Oct: 6:40 AM – 5:20 PM · 10h 40m
Nov: 7:24 AM – 4:36 PM · 9h 12m
Dec: 7:46 AM – 4:14 PM · 8h 29m
Daylight Longest: 15h 33m · Shortest: 8h 28m

Nearby Stations

Trident, MTMay 9 - September 27 Bozeman Gallatin Fld, MT May 26 - September 16 Bozeman 6 W Exp Farm, MT May 23 - September 23 Bozeman Montana State Univ, MT May 26 - September 22 Norris Madison Pwr House, MT April 30 - October 10 Townsend 3se, MT May 19 - September 19

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