Last spring frost
Apr 13
Frost Dates for Lake Marcel-Stillwater, WA
First fall frost
Nov 10
Growing season
210 days
Hardiness zone
8b
In an average year around Lake Marcel-Stillwater, WA, the last spring frost (32°F) is about Apr 13 and the first fall frost is about Nov 10, giving roughly a 210-day growing season. To be safe most years, wait until Mar 23 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 21 | May 3 | Apr 17 |
| Freeze (32°F) | May 4 | Apr 13 | Mar 23 |
| Hard (28°F) | Apr 6 | Mar 14 | Feb 16 |
| Severe (24°F) | Mar 11 | Feb 6 | Dec 20 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 21 | May 15 | May 11 | May 7 | May 3 | Apr 30 | Apr 27 | Apr 23 | Apr 17 |
| 32°F | May 4 | Apr 29 | Apr 23 | Apr 18 | Apr 13 | Apr 7 | Apr 3 | Mar 31 | Mar 23 |
| 28°F | Apr 6 | Mar 29 | Mar 23 | Mar 18 | Mar 14 | Mar 9 | Mar 4 | Feb 26 | Feb 16 |
| 24°F | Mar 11 | Mar 1 | Feb 23 | Feb 16 | Feb 6 | Jan 27 | Jan 13 | Jan 3 | Dec 20 |
| 20°F | Feb 22 | Feb 13 | Jan 31 | Jan 18 | Jan 7 | Dec 31 | Dec 22 | Dec 11 | Dec 2 |
| 16°F | Feb 16 | Jan 29 | Jan 10 | Jan 1 | Dec 24 | Dec 17 | Dec 9 | Dec 5 | Nov 27 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 8 | Oct 24 | Nov 9 |
| Freeze (32°F) | Oct 24 | Nov 10 | Nov 28 |
| Hard (28°F) | Nov 7 | Nov 28 | Dec 23 |
| Severe (24°F) | Nov 22 | Dec 16 | Feb 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 8 | Oct 15 | Oct 18 | Oct 21 | Oct 24 | Oct 26 | Oct 30 | Nov 3 | Nov 9 |
| 32°F | Oct 24 | Oct 30 | Nov 2 | Nov 7 | Nov 10 | Nov 14 | Nov 17 | Nov 22 | Nov 28 |
| 28°F | Nov 7 | Nov 13 | Nov 18 | Nov 23 | Nov 28 | Dec 2 | Dec 7 | Dec 14 | Dec 23 |
| 24°F | Nov 22 | Nov 28 | Dec 3 | Dec 9 | Dec 16 | Dec 24 | Jan 1 | Jan 13 | Feb 2 |
| 20°F | Nov 25 | Dec 2 | Dec 8 | Dec 16 | Dec 24 | Dec 31 | Jan 7 | Jan 23 | Feb 13 |
| 16°F | Nov 24 | Dec 1 | Dec 6 | Dec 11 | Dec 18 | Dec 26 | Jan 1 | Jan 21 | Feb 5 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Tolt S Fk Rsvr, Wa, about 7.2 miles away@if(!empty($station['elevation_ft'])), at 2,000 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Lake Marcel-Stillwater, WA?
On average, the last spring frost (32°F) around Lake Marcel-Stillwater, WA is about Apr 13. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 23.
When is the first frost in the fall?
The first fall frost around Lake Marcel-Stillwater, WA typically arrives about Nov 10. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 13 on average, or Mar 23 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 210 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 98014 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026