Frost dates for 83440 — Rexburg, ID
Last spring frostMay 12median date
First fall frostSep 24median date
Growing season135 daysfrost-free
Hardiness zone5aZone 5a
How Rexburg compares
- In 8 years out of 10, the last spring frost in Rexburg falls between April 29 and June 2, a 34-day window. The first fall frost falls between September 6 and October 8.
- The median last frost is 2 days earlier than the Idaho median of May 14.
- Its 135-day growing season is longer than 42% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 9 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 184 nights a year at or below 32°F.
- Compared with Idaho Falls, ID, 40 km away, the last frost here is 3 days later than there and the growing season is 10 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 29 |
| 50% (median) | May 12 |
| 10% (safe for tender plants) | June 2 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 6 |
| 50% (median) | September 24 |
| 90% (late) | October 8 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Rexburg, ID
Frost dates for 83440 — Rexburg, ID — last frost May 12, first frost Sep 24, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Feb 17 to Mar 3Transplant outside: Apr 14 to Apr 28
Start indoors: Mar 3 to Mar 17Transplant outside: May 26 to Jun 9
Start indoors: Mar 3 to Mar 17Transplant outside: May 26 to Jun 9
Start indoors: Mar 17 to Mar 31Transplant outside: May 19 to Jun 2
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 21 to May 5Sow outdoors: Apr 14 to May 19Plant for fall: Jul 30 to Aug 27
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 14 to Apr 28Sow outdoors: Apr 14 to Apr 28Plant for fall: Jul 16 to Aug 6
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 28 to May 12Plant for fall: Jun 18 to Jul 9
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 21 to May 5Plant for fall: Jun 18 to Jul 9
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 28 to May 12Plant for fall: Jun 18 to Jul 9
Start indoors: Mar 31 to Apr 14Transplant outside: Jun 2 to Jun 16Sow outdoors: Jun 2 to Jun 16
Start indoors: Mar 31 to Apr 14Transplant outside: May 19 to Jun 2
Sow outdoors: Mar 31 to Apr 21Plant for fall: Jul 2 to Jul 23
Sow outdoors: Mar 31 to Apr 21Plant for fall: Jul 30 to Aug 20
Sow outdoors: Apr 7 to May 19Plant for fall: Aug 13 to Sep 3
Start indoors: Apr 14 to Apr 21Transplant outside: May 26 to Jun 2Sow outdoors: May 19 to Jun 2Plant for fall: Jul 9 to Jul 23
Start indoors: Apr 14 to Apr 21Sow outdoors: May 19 to Jun 2Plant for fall: Jul 16 to Jul 30
Start indoors: Apr 14 to Apr 21Sow outdoors: May 19 to Jun 2
Start indoors: Apr 14 to Apr 21Transplant outside: May 26 to Jun 9
Sow outdoors: Apr 21 to May 19Plant for fall: Jul 2 to Jul 16
Sow outdoors: Apr 21 to May 19Plant for fall: Jul 16 to Jul 30
Sow outdoors: Apr 21 to May 12
Sow outdoors: Apr 28 to May 26Plant for fall: Jul 16 to Jul 30
Sow outdoors: Apr 28 to May 19Plant for fall: Jul 30 to Aug 20
Sow outdoors: May 19 to Jun 9Plant for fall: Jul 9 to Jul 23
Sow outdoors: May 19 to Jun 2
Transplant outside: May 26 to Jun 16
Plant for fall: Sep 10 to Oct 15
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Rexburg, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 17 – Mar 3 | Apr 14 – Apr 28 | — | — |
| Peppers | Mar 3 – Mar 17 | May 26 – Jun 9 | — | — |
| Eggplant | Mar 3 – Mar 17 | May 26 – Jun 9 | — | — |
| Tomatoes | Mar 17 – Mar 31 | May 19 – Jun 2 | — | — |
| Lettuce | Mar 17 – Mar 31 | Apr 21 – May 5 | Apr 14 – May 19 | Jul 30 – Aug 27 |
| Kale | Mar 17 – Mar 31 | Apr 14 – Apr 28 | Apr 14 – Apr 28 | Jul 16 – Aug 6 |
| Broccoli | Mar 17 – Mar 31 | Apr 28 – May 12 | — | Jun 18 – Jul 9 |
| Cabbage | Mar 17 – Mar 31 | Apr 21 – May 5 | — | Jun 18 – Jul 9 |
| Cauliflower | Mar 17 – Mar 31 | Apr 28 – May 12 | — | Jun 18 – Jul 9 |
| Okra | Mar 31 – Apr 14 | Jun 2 – Jun 16 | Jun 2 – Jun 16 | — |
| Basil | Mar 31 – Apr 14 | May 19 – Jun 2 | — | — |
| Peas | — | — | Mar 31 – Apr 21 | Jul 2 – Jul 23 |
| Spinach | — | — | Mar 31 – Apr 21 | Jul 30 – Aug 20 |
| Radishes | — | — | Apr 7 – May 19 | Aug 13 – Sep 3 |
| Cucumbers | Apr 14 – Apr 21 | May 26 – Jun 2 | May 19 – Jun 2 | Jul 9 – Jul 23 |
| Zucchini & Summer Squash | Apr 14 – Apr 21 | — | May 19 – Jun 2 | Jul 16 – Jul 30 |
| Winter Squash & Pumpkins | Apr 14 – Apr 21 | — | May 19 – Jun 2 | — |
| Melons & Watermelon | Apr 14 – Apr 21 | May 26 – Jun 9 | — | — |
| Carrots | — | — | Apr 21 – May 19 | Jul 2 – Jul 16 |
| Beets | — | — | Apr 21 – May 19 | Jul 16 – Jul 30 |
| Potatoes | — | — | Apr 21 – May 12 | — |
| Swiss Chard | — | — | Apr 28 – May 26 | Jul 16 – Jul 30 |
| Cilantro | — | — | Apr 28 – May 19 | Jul 30 – Aug 20 |
| Green Beans | — | — | May 19 – Jun 9 | Jul 9 – Jul 23 |
| Sweet Corn | — | — | May 19 – Jun 2 | — |
| Sweet Potatoes | — | May 26 – Jun 16 | — | — |
| Garlic | — | — | — | Sep 10 – Oct 15 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Rexburg Byu Idaho, ID weather station, about 1 km away (elevation 5,007 ft (1,526 m)).
ZIP codes in Rexburg: 83440 83441 83460
Frost dates near Rexburg
- Sugar City May 29 · Sep 13
- Teton May 29 · Sep 13
- Parker May 17 · Sep 22
- Newdale May 17 · Sep 22
- Rigby May 9 · Oct 5
- Menan May 9 · Oct 5
- Saint Anthony May 17 · Sep 22
- Lewisville May 9 · Oct 5
Frequently asked questions
When is the last frost in Rexburg, ID?
The median last spring frost in Rexburg, ID is May 12. There is still about a 10% chance of frost after June 2, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Rexburg, ID?
The median first fall frost is September 24, with about a 10% chance of frost before September 6.
How long is the growing season in Rexburg, ID?
About 135 days between the median last spring frost and first fall frost.
What planting zone is Rexburg, ID?
Rexburg, ID is in USDA hardiness zone 5a.