When to plant in Covington, WA
USDA Zone 8bCovington, Washington frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 8b means many perennials and even some tender shrubs overwinter in Covington, while your frost dates still decide when annuals go out.
Frost probability
LANDSBURG · 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 Covington’s own odds, recorded at LANDSBURG.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 7 | May 10 | Apr 23 | Sep 19 | Oct 6 | Oct 26 |
| 32°F | May 10 | Apr 20 | Mar 31 | Oct 5 | Oct 25 | Nov 12 |
| 28°F | Apr 16 | Mar 24 | Feb 28 | Oct 24 | Nov 12 | Dec 8 |
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 Covington, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 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.
Covington planting FAQ
When is the last spring frost in Covington, WA?
Covington's average last spring frost falls near April 20 — 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 Covington, WA?
In Covington, the first 32°F freeze of fall lands around October 25 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Covington in?
Covington is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Covington?
There are roughly 188 frost-free days in Covington (a moderate growing season), running from the average last frost around April 20 to the first fall frost near October 25.
When should I plant tomatoes in Covington?
In Covington, start tomato seeds indoors around February 23–March 9, then transplant seedlings outdoors around April 27 once the danger of frost has passed.
Never miss a window in Covington
An email when it’s time to start seeds, transplant, and sow — timed to Covington’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Lake Morton-Berrydale · 4 km
- Maple Valley · 5 km
- Kent · 9 km
- Fairwood · 10 km
- Auburn · 10 km
- East Renton Highlands · 12 km
- Lakeland North · 14 km
- Renton · 14 km
Frost dates recorded at LANDSBURG, 11 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 Covington, WA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00454486. Retrieved from https://blissgarden.com/washington/covington.