Last spring frost
Apr 20
Frost Dates for Lake Holm, WA
First fall frost
Oct 25
Growing season
187 days
Hardiness zone
8b
In an average year around Lake Holm, WA, the last spring frost (32°F) is about Apr 20 and the first fall frost is about Oct 25, giving roughly a 187-day growing season. To be safe most years, wait until Mar 31 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) | Jun 7 | May 10 | Apr 23 |
| Freeze (32°F) | May 10 | Apr 20 | Mar 31 |
| Hard (28°F) | Apr 16 | Mar 24 | Feb 28 |
| Severe (24°F) | Mar 18 | Feb 22 | Jan 3 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 7 | May 27 | May 20 | May 15 | May 10 | May 6 | May 2 | Apr 29 | Apr 23 |
| 32°F | May 10 | May 4 | Apr 29 | Apr 25 | Apr 20 | Apr 16 | Apr 12 | Apr 6 | Mar 31 |
| 28°F | Apr 16 | Apr 7 | Apr 2 | Mar 29 | Mar 24 | Mar 19 | Mar 14 | Mar 7 | Feb 28 |
| 24°F | Mar 18 | Mar 10 | Mar 4 | Feb 28 | Feb 22 | Feb 16 | Feb 5 | Jan 22 | Jan 3 |
| 20°F | Feb 28 | Feb 21 | Feb 13 | Feb 1 | Jan 20 | Jan 6 | Dec 30 | Dec 16 | Dec 4 |
| 16°F | Feb 11 | Jan 22 | Jan 6 | Jan 1 | Dec 30 | Dec 24 | Dec 15 | Dec 9 | Dec 1 |
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) | Sep 19 | Oct 6 | Oct 26 |
| Freeze (32°F) | Oct 5 | Oct 25 | Nov 12 |
| Hard (28°F) | Oct 24 | Nov 12 | Dec 8 |
| Severe (24°F) | Nov 8 | Dec 1 | Jan 3 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 19 | Sep 27 | Oct 1 | Oct 3 | Oct 6 | Oct 9 | Oct 14 | Oct 18 | Oct 26 |
| 32°F | Oct 5 | Oct 13 | Oct 17 | Oct 21 | Oct 25 | Oct 29 | Nov 1 | Nov 6 | Nov 12 |
| 28°F | Oct 24 | Oct 31 | Nov 3 | Nov 8 | Nov 12 | Nov 17 | Nov 23 | Nov 30 | Dec 8 |
| 24°F | Nov 8 | Nov 14 | Nov 21 | Nov 26 | Dec 1 | Dec 7 | Dec 13 | Dec 21 | Jan 3 |
| 20°F | Nov 17 | Nov 28 | Dec 3 | Dec 11 | Dec 18 | Dec 26 | Jan 1 | Jan 14 | Feb 6 |
| 16°F | Nov 25 | Dec 2 | Dec 10 | Dec 14 | Dec 22 | Dec 28 | Jan 1 | Jan 9 | Feb 2 |
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: Landsburg, Wa, about 9.7 miles away@if(!empty($station['elevation_ft'])), at 535 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 Holm, WA?
On average, the last spring frost (32°F) around Lake Holm, WA is about Apr 20. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 31.
When is the first frost in the fall?
The first fall frost around Lake Holm, WA typically arrives about Oct 25. 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 20 on average, or Mar 31 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 187 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 98092 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026