When to plant in Liberty Lake, WA
USDA Zone 6bLiberty Lake, Washington frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Heads up: the nearest complete-normals station is about 16 km from Liberty Lake, so your yard's frost dates can differ — a low spot or a paved city center can shift them by a week. Zone 6b means Liberty Lake 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 Liberty Lake is now 7 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
SPOKANE FELTS FLD · 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 Liberty Lake’s own odds, recorded at SPOKANE FELTS FLD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 25 | May 9 | Apr 27 | Sep 19 | Oct 1 | Oct 15 |
| 32°F | May 10 | Apr 26 | Apr 10 | Sep 30 | Oct 15 | Oct 31 |
| 28°F | Apr 26 | Apr 4 | Mar 16 | Oct 11 | Oct 27 | Nov 13 |
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 Liberty Lake, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 32 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.
Liberty Lake planting FAQ
When is the last spring frost in Liberty Lake, WA?
Liberty Lake's average last spring frost falls near April 26 — 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 Liberty Lake, WA?
The first fall frost in Liberty Lake typically arrives around October 15 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Liberty Lake in?
Liberty Lake 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 Liberty Lake?
There are roughly 172 frost-free days in Liberty Lake (a moderate growing season), running from the average last frost around April 26 to the first fall frost near October 15.
When should I plant tomatoes in Liberty Lake?
In Liberty Lake, start tomato seeds indoors around March 1–March 15, then transplant seedlings outdoors around May 3 once the danger of frost has passed.
Never miss a window in Liberty Lake
An email when it’s time to start seeds, transplant, and sow — timed to Liberty Lake’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Spokane Valley · 10 km
- Post Falls · 14 km
- Rathdrum · 21 km
- Coeur d'Alene · 23 km
- Spokane · 25 km
- Hayden · 25 km
- Airway Heights · 36 km
- Cheney · 41 km
Frost dates recorded at SPOKANE FELTS FLD, 16 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 Liberty Lake, WA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094176. Retrieved from https://blissgarden.com/washington/liberty-lake.