Last spring frost
Apr 21
Frost Dates for Bell Hill, WA
First fall frost
Oct 20
Growing season
181 days
Hardiness zone
8b
In an average year around Bell Hill, WA, the last spring frost (32°F) is about Apr 21 and the first fall frost is about Oct 20, giving roughly a 181-day growing season. To be safe most years, wait until Apr 3 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 26 | May 7 | Apr 24 |
| Freeze (32°F) | May 7 | Apr 21 | Apr 3 |
| Hard (28°F) | Apr 17 | Mar 28 | Mar 2 |
| Severe (24°F) | Mar 25 | Feb 24 | Jan 11 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 26 | May 19 | May 14 | May 11 | May 7 | May 3 | Apr 30 | Apr 28 | Apr 24 |
| 32°F | May 7 | May 1 | Apr 28 | Apr 24 | Apr 21 | Apr 16 | Apr 13 | Apr 9 | Apr 3 |
| 28°F | Apr 17 | Apr 10 | Apr 4 | Mar 31 | Mar 28 | Mar 23 | Mar 17 | Mar 11 | Mar 2 |
| 24°F | Mar 25 | Mar 13 | Mar 4 | Feb 28 | Feb 24 | Feb 19 | Feb 13 | Feb 1 | Jan 11 |
| 20°F | Feb 28 | Feb 21 | Feb 13 | Feb 4 | Jan 24 | Jan 13 | Jan 2 | Dec 21 | Dec 5 |
| 16°F | Feb 15 | Feb 5 | Jan 26 | Jan 13 | Jan 3 | Dec 29 | Dec 19 | Dec 6 | 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) | Sep 20 | Oct 3 | Oct 17 |
| Freeze (32°F) | Oct 3 | Oct 20 | Nov 3 |
| Hard (28°F) | Oct 19 | Nov 7 | Dec 1 |
| Severe (24°F) | Nov 4 | Nov 29 | Dec 29 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 20 | Sep 24 | Sep 28 | Oct 1 | Oct 3 | Oct 5 | Oct 9 | Oct 13 | Oct 17 |
| 32°F | Oct 3 | Oct 8 | Oct 13 | Oct 17 | Oct 20 | Oct 22 | Oct 25 | Oct 30 | Nov 3 |
| 28°F | Oct 19 | Oct 26 | Oct 30 | Nov 2 | Nov 7 | Nov 10 | Nov 15 | Nov 22 | Dec 1 |
| 24°F | Nov 4 | Nov 12 | Nov 19 | Nov 24 | Nov 29 | Dec 2 | Dec 8 | Dec 17 | Dec 29 |
| 20°F | Nov 18 | Nov 26 | Dec 1 | Dec 6 | Dec 14 | Dec 21 | Dec 31 | Jan 10 | Feb 2 |
| 16°F | Nov 20 | Nov 30 | Dec 7 | Dec 16 | Dec 25 | Jan 1 | Jan 9 | Jan 19 | Feb 7 |
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: Sequim 2 E, Wa, about 4.7 miles away@if(!empty($station['elevation_ft'])), at 50 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 Bell Hill, WA?
On average, the last spring frost (32°F) around Bell Hill, WA is about Apr 21. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 3.
When is the first frost in the fall?
The first fall frost around Bell Hill, WA typically arrives about Oct 20. 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 21 on average, or Apr 3 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 181 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 98382 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026