Frost Dates for Rexburg, ID
Based on data from Rexburg Madison Co AP weather station, 1 miles away
Elevation: 4865 ft
Frost Dates
Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide.
May 15
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date.
September 23
30% Probability
Only 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 21
First Fall Frost
September 18
Hard Freeze (28°F)
Last Spring Hard Freeze
May 1
First Fall Hard Freeze
October 5
Growing Season
131 Days
May 15 to September 23
USDA Hardiness Zone
Hardiness 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 5b
Avg. annual minimum: −15 to −10°F
Köppen Climate
The 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.
Temperature
10°
30°
50°
70°
90°
Avg High
Avg Temp
Avg Low
Light Frost (32°F)
Hard Frost (28°F)
Temperature table
| Month | Avg High | Avg Temp | Avg Low |
|---|---|---|---|
| January | 28° | 20° | 13° |
| February | 32° | 24° | 16° |
| March | 45° | 35° | 25° |
| April | 56° | 44° | 32° |
| May | 66° | 53° | 40° |
| June | 74° | 60° | 46° |
| July | 85° | 68° | 52° |
| August | 84° | 67° | 50° |
| September | 73° | 57° | 42° |
| October | 57° | 45° | 32° |
| November | 41° | 32° | 23° |
| December | 29° | 22° | 14° |
Precipitation
0"
1"
2"
3.0"
Precipitation table
| Month | Precipitation |
|---|---|
| January | 1.6 |
| February | 1.3 |
| March | 1.8 |
| April | 2.4 |
| May | 2.7 |
| June | 2.4 |
| July | 1.5 |
| August | 1.4 |
| September | 3.0 |
| October | 2.6 |
| November | 1.7 |
| December | 1.6 |
Sunrise / Sunset
Daylight
Mountain Time (MT)
Longest: 15h 17m · Shortest: 8h 43m
Sunrise and sunset table
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 8:04 AM | 5:09 PM | 9h 04m |
| February | 7:34 AM | 5:49 PM | 10h 15m |
| March | 7:48 AM | 7:26 PM | 11h 38m |
| April | 6:51 AM | 8:04 PM | 13h 13m |
| May | 6:07 AM | 8:40 PM | 14h 33m |
| June | 5:50 AM | 9:05 PM | 15h 16m |
| July | 6:04 AM | 9:02 PM | 14h 58m |
| August | 6:37 AM | 8:26 PM | 13h 49m |
| September | 7:13 AM | 7:30 PM | 12h 17m |
| October | 7:50 AM | 6:35 PM | 10h 45m |
| November | 7:30 AM | 4:54 PM | 9h 24m |
| December | 8:01 AM | 4:45 PM | 8h 44m |
Nearby Stations
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