When to plant in Nampa, ID
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in Nampa, Idaho — is derived from the closest NOAA station with complete climate normals.
In zone 7a, Nampa supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
The average first fall frost in Nampa is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
NAMPA SUGAR FACTORY · 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 Nampa’s own odds, recorded at NAMPA SUGAR FACTORY.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 6 | May 16 | May 1 | Sep 15 | Sep 30 | Oct 14 |
| 32°F | May 18 | Apr 29 | Apr 15 | Sep 29 | Oct 13 | Oct 28 |
| 28°F | May 1 | Apr 11 | Mar 25 | Oct 9 | Oct 25 | Nov 10 |
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 Nampa, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 26 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.
Nampa planting FAQ
When is the last spring frost in Nampa, ID?
Nampa's average last spring frost falls near April 29 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Nampa, ID?
The first fall frost in Nampa typically arrives around October 13 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Nampa in?
Nampa 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 Nampa?
Nampa has about 167 frost-free days — a moderate growing season — between the average last spring frost (April 29) and first fall frost (October 13).
When should I plant tomatoes in Nampa?
For Nampa, sow tomatoes indoors about March 4–March 18 and move the seedlings out around May 6, after the last spring frost.
Never miss a window in Nampa
An email when it’s time to start seeds, transplant, and sow — timed to Nampa’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Caldwell · 10 km
- Meridian · 13 km
- Star · 14 km
- Middleton · 14 km
- Kuna · 15 km
- Eagle · 18 km
- Garden City · 24 km
- Boise City · 27 km
Frost dates recorded at NAMPA SUGAR FACTORY, 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 Nampa, ID — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00106305. Retrieved from https://blissgarden.com/idaho/nampa.