When to plant in Post Falls, ID
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Post Falls, Idaho — all computed from Post Falls's nearest NOAA weather station.
In zone 6b, Post Falls gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
COEUR D'ALENE · 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 Post Falls’s own odds, recorded at COEUR D'ALENE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 21 | May 7 | Apr 25 | Sep 23 | Oct 6 | Oct 21 |
| 32°F | May 6 | Apr 22 | Apr 4 | Oct 4 | Oct 18 | Nov 5 |
| 28°F | Apr 21 | Apr 1 | Mar 13 | Oct 15 | Nov 1 | Nov 20 |
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 Post Falls, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 40 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.
Post Falls planting FAQ
When is the last spring frost in Post Falls, ID?
Post Falls's average last spring frost falls near April 22 — 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 Post Falls, ID?
In Post Falls, the first 32°F freeze of fall lands around October 18 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Post Falls in?
Post Falls 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 Post Falls?
Post Falls has about 179 frost-free days — a moderate growing season — between the average last spring frost (April 22) and first fall frost (October 18).
When should I plant tomatoes in Post Falls?
For Post Falls, sow tomatoes indoors about February 25–March 11 and move the seedlings out around April 29, after the last spring frost.
Never miss a window in Post Falls
An email when it’s time to start seeds, transplant, and sow — timed to Post Falls’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Rathdrum · 9 km
- Coeur d'Alene · 11 km
- Hayden · 12 km
- Liberty Lake · 14 km
- Spokane Valley · 23 km
- Spokane · 37 km
- Airway Heights · 48 km
- Cheney · 54 km
Frost dates recorded at COEUR D'ALENE, 12 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 Post Falls, ID — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00101956. Retrieved from https://blissgarden.com/idaho/post-falls.