When to plant in Mountain Home, ID
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in Mountain Home, Idaho — is derived from the closest NOAA station with complete climate normals.
In zone 7a, Mountain Home supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
The average last spring frost in Mountain Home is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
MTN HOME · 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 Mountain Home’s own odds, recorded at MTN HOME.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 10 | May 17 | Apr 30 | Sep 11 | Sep 28 | Oct 11 |
| 32°F | May 23 | May 2 | Apr 18 | Sep 25 | Oct 8 | Oct 24 |
| 28°F | May 8 | Apr 18 | Apr 1 | Oct 4 | Oct 20 | Nov 5 |
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 Mountain Home, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 37 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.
Mountain Home planting FAQ
When is the last spring frost in Mountain Home, ID?
Plan for the last spring frost in Mountain Home around May 2 (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 Mountain Home, ID?
The first fall frost in Mountain Home typically arrives around October 8 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Mountain Home in?
Mountain Home is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Mountain Home?
Mountain Home has about 159 frost-free days — a moderate growing season — between the average last spring frost (May 2) and first fall frost (October 8).
When should I plant tomatoes in Mountain Home?
For Mountain Home, sow tomatoes indoors about March 7–March 21 and move the seedlings out around May 9, after the last spring frost.
Never miss a window in Mountain Home
An email when it’s time to start seeds, transplant, and sow — timed to Mountain Home’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Boise City · 67 km
- Kuna · 72 km
- Garden City · 77 km
- Meridian · 78 km
- Eagle · 85 km
- Nampa · 86 km
- Star · 90 km
- Caldwell · 97 km
Frost dates recorded at MTN HOME, 1 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 Mountain Home, ID — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00106174. Retrieved from https://blissgarden.com/idaho/mountain-home.