When to plant in Moscow, ID
USDA Zone 6bMoscow, 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 6b, Moscow gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average last spring frost in Moscow is now 12 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
PULLMAN MOSCOW RGNL AP · 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 Moscow’s own odds, recorded at PULLMAN MOSCOW RGNL AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 14 | May 18 | May 2 | Aug 28 | Sep 19 | Oct 5 |
| 32°F | May 14 | Apr 29 | Apr 7 | Sep 17 | Oct 2 | Oct 25 |
| 28°F | Apr 27 | Apr 3 | Mar 9 | Sep 29 | Oct 18 | Nov 15 |
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 Moscow, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 28 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.
Moscow planting FAQ
When is the last spring frost in Moscow, ID?
Moscow'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 Moscow, ID?
The first fall frost in Moscow typically arrives around October 2 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Moscow in?
Moscow 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 Moscow?
Moscow has about 156 frost-free days — a moderate growing season — between the average last spring frost (April 29) and first fall frost (October 2).
When should I plant tomatoes in Moscow?
For Moscow, 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 Moscow
An email when it’s time to start seeds, transplant, and sow — timed to Moscow’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Pullman · 13 km
- Lewiston · 38 km
- Cheney · 95 km
- Liberty Lake · 105 km
- Spokane Valley · 105 km
- Spokane · 109 km
- Coeur d'Alene · 109 km
- Post Falls · 111 km
Frost dates recorded at PULLMAN MOSCOW RGNL AP, 8 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 Moscow, ID — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094129. Retrieved from https://blissgarden.com/idaho/moscow.