Last frost date in Rexburg, ID
In Rexburg, the last spring frost comes around May 12 in an average year. Wait until June 2 if you want 90% odds of no more frost. The first fall frost usually arrives about September 24, which leaves 132 frost-free days. An early freeze before September 6 happens one year in ten.
- Safe after (10% risk)
- Jun 2
- Average first frost
- Sep 24
- Frost-free season
- 132 days
- Hard freeze (28°F) ends
- Apr 30
Frost likely Fri night, low 31°F
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2242°
- FriOct 2331°frost
- SatOct 2427°hard freeze
- SunOct 2528°hard freeze
- MonOct 2629°frost
- TueOct 2728°hard freeze
- WedOct 2829°frost
Planting calendar for Rexburg
Windows count forward or back from the average frost dates above. Click a crop for dates across Idaho.
TomatoesMay 19–Jun 2
PumpkinsMay 26–Jun 9
SunflowersMay 12–Jun 2
CucumbersMay 26–Jun 2
CornMay 19–Jun 2
Sweet potatoesJun 2–Jun 16
WatermelonMay 26–Jun 9
Green beansMay 19–Jun 9
ZucchiniMay 19–Jun 2
OkraJun 2–Jun 16
PeppersMay 26–Jun 9
BasilMay 19–Jun 2
Butternut squashMay 19–Jun 2
CantaloupeMay 26–Jun 9
EggplantMay 26–Jun 9
PotatoesApr 14–Apr 28
OnionsMar 31–Apr 21
CarrotsApr 21–May 26
LettuceApr 28–May 19
BroccoliApr 14–Apr 28
BeetsApr 14–May 26
PeasMar 31–Apr 14
CabbageApr 14–Apr 28
RadishesApr 7–May 19
Brussels sproutsApr 28–May 12
SpinachMar 31–Apr 21
CilantroApr 28–May 19
KaleApr 14–Apr 28
Collard greensApr 14–Apr 28
TurnipsApr 14–Apr 28
DillMay 12–May 26
CeleryMay 19–May 26
CauliflowerApr 28–May 12
LeeksApr 28–May 12
Swiss chardApr 28–May 26
ParsleyApr 28–May 19
Tulip bulbsSep 10–Oct 15
GarlicSep 3–Oct 8
Daffodil bulbsAug 27–Oct 8
StrawberriesApr 14–Apr 28
AsparagusApr 14–Apr 28The frost-free season here is short for pumpkins, sweet potatoes. Start them indoors and look for early varieties.
Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 29 | May 12 | Jun 2 | Sep 6 | Sep 24 | Oct 8 |
| Hard freeze, 28°F | Apr 12 | Apr 30 | May 14 | Sep 20 | Oct 7 | Oct 21 |
Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.
Where these numbers come from
NOAA station Rexburg Byu Idaho (USC00107644) sits 1.0 miles from the center of Rexburg at 5,005 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.
Questions
When is the last frost in Rexburg, ID?
The average last frost date in Rexburg is May 12, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after June 2.
When is the first frost in Rexburg?
The first frost in fall usually comes around September 24. One year in ten it arrives before September 6.
How long is the growing season in Rexburg?
About 132 days between the average last and first frost.
When should I plant tomatoes in Rexburg?
Plant tomato seedlings outside from May 19 to June 2. Start seeds indoors six to eight weeks earlier.
Nearby in Idaho
- AmmonMay 9
- Idaho FallsMay 9
- PocatelloMay 2
- Twin FallsApr 30
- Boise CityApr 24
- EagleApr 29
- MeridianApr 24
- KunaApr 24
- StarApr 29
- NampaApr 29
- CaldwellApr 29
- LewistonApr 6