When to plant in Rexburg, ID
USDA Zone 5aRexburg, Idaho frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 5a, Rexburg gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
REXBURG BYU IDAHO · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Rexburg’s own odds, recorded at REXBURG BYU IDAHO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 22 | Jun 4 | May 16 | Aug 28 | Sep 11 | Sep 25 |
| 32°F | Jun 2 | May 12 | Apr 29 | Sep 6 | Sep 24 | Oct 8 |
| 28°F | May 14 | Apr 30 | Apr 12 | Sep 20 | Oct 7 | Oct 21 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Rexburg, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 8 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Rexburg planting FAQ
When is the last spring frost in Rexburg, ID?
Plan for the last spring frost in Rexburg around May 12 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Rexburg, ID?
In Rexburg, the first 32°F freeze of fall lands around September 24 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Rexburg in?
Rexburg is in USDA hardiness zone 5a. In zone 5a, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Rexburg?
Rexburg has about 135 frost-free days — a short growing season — between the average last spring frost (May 12) and first fall frost (September 24).
When should I plant tomatoes in Rexburg?
For Rexburg, sow tomatoes indoors about March 17–March 31 and move the seedlings out around May 19, after the last spring frost.
Never miss a window in Rexburg
An email when it’s time to start seeds, transplant, and sow — timed to Rexburg’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at REXBURG BYU IDAHO, 2 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Rexburg, ID — Frost Dates & Zone 5a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00107644. Retrieved from https://blissgarden.com/idaho/rexburg.