When to plant in Jerome, ID
USDA Zone 6bJerome, Idaho frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 6b means Jerome sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
The average last spring frost in Jerome is now 10 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
JEROME · 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 Jerome’s own odds, recorded at JEROME.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 8 | May 15 | Apr 30 | Sep 17 | Oct 3 | Oct 17 |
| 32°F | May 30 | May 2 | Apr 15 | Sep 30 | Oct 14 | Oct 29 |
| 28°F | May 10 | Apr 14 | Mar 24 | Oct 13 | Oct 27 | Nov 11 |
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 Jerome, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 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.
Jerome planting FAQ
When is the last spring frost in Jerome, ID?
On average, the last spring frost in Jerome is around May 2 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Jerome, ID?
The first fall frost in Jerome typically arrives around October 14 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Jerome in?
Jerome is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Jerome?
There are roughly 165 frost-free days in Jerome (a moderate growing season), running from the average last frost around May 2 to the first fall frost near October 14.
When should I plant tomatoes in Jerome?
In Jerome, start tomato seeds indoors around March 7–March 21, then transplant seedlings outdoors around May 9 once the danger of frost has passed.
Never miss a window in Jerome
An email when it’s time to start seeds, transplant, and sow — timed to Jerome’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Twin Falls · 18 km
- Burley · 63 km
- Mountain Home · 107 km
- Pocatello · 168 km
- Chubbuck · 169 km
- Boise City · 170 km
- Kuna · 178 km
- Garden City · 179 km
Frost dates recorded at JEROME, 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 Jerome, ID — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00104670. Retrieved from https://blissgarden.com/idaho/jerome.