Frost Dates for Lame Deer, MT

Based on data from Busby weather station, 15 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 23
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 May 29
First Fall Frost September 9

Hard Freeze (28°F)

Last Spring Hard Freeze May 11
First Fall Hard Freeze September 27
45.62°N, -106.67°W © OpenStreetMap

Growing Season

115 Days May 23 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 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.

Dfa Hot-Summer Continental

Hot summers and cold winters with year-round precipitation. Moderate growing season supports warm-season crops like tomatoes, peppers, and corn. Winter protection extends the harvest.

Köppen climate map

Temperature

0° 30° 60° 90°
21°
High: 34°F
Avg: 21°F
Low: 9°F
Jan
24°
High: 37°F
Avg: 24°F
Low: 11°F
Feb
35°
High: 49°F
Avg: 35°F
Low: 21°F
Mar
44°
High: 59°F
Avg: 44°F
Low: 30°F
Apr
53°
High: 68°F
Avg: 53°F
Low: 39°F
May
63°
High: 78°F
Avg: 63°F
Low: 47°F
Jun
71°
High: 88°F
Avg: 71°F
Low: 53°F
Jul
69°
High: 88°F
Avg: 69°F
Low: 51°F
Aug
59°
High: 77°F
Avg: 59°F
Low: 41°F
Sep
45°
High: 61°F
Avg: 45°F
Low: 30°F
Oct
33°
High: 46°F
Avg: 33°F
Low: 19°F
Nov
23°
High: 36°F
Avg: 23°F
Low: 10°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 2" 4" 5.1"
2.0"
1.96"
Jan
1.7"
1.68"
Feb
2.4"
2.37"
Mar
3.6"
3.60"
Apr
5.1"
5.09"
May
5.1"
5.09"
Jun
4.2"
4.15"
Jul
4.6"
4.57"
Aug
4.8"
4.83"
Sep
3.6"
3.65"
Oct
2.3"
2.26"
Nov
2.0"
1.99"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9h8.5h
Jan: 7:33 AM – 4:27 PM · 8h 53m
Feb: 6:56 AM – 5:04 PM · 10h 09m
Mar: 6:12 AM – 5:48 PM · 11h 37m
Apr: 5:21 AM – 6:39 PM · 13h 18m
May: 4:39 AM – 7:21 PM · 14h 42m
Jun: 4:16 AM – 7:44 PM · 15h 28m
Jul: 4:25 AM – 7:35 PM · 15h 10m
Aug: 5:02 AM – 6:58 PM · 13h 56m
Sep: 5:51 AM – 6:09 PM · 12h 18m
Oct: 6:40 AM – 5:20 PM · 10h 41m
Nov: 7:23 AM – 4:37 PM · 9h 14m
Dec: 7:44 AM – 4:16 PM · 8h 31m
Daylight Longest: 15h 30m · Shortest: 8h 30m

Nearby Stations

Hysham 25 Sse, MT May 26 - September 16 Colstrip, MTMay 15 - September 30 Hardin, MTMay 13 - September 29 Wyola 1 Sw, MT May 21 - September 17 Brandenberg, MT May 18 - September 22 Dayton, WYMay 24 - September 18

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview