Last spring frost
Apr 24
Frost Dates for Glacier, WA
First fall frost
Oct 29
Growing season
190 days
Hardiness zone
8a
In an average year around Glacier, WA, the last spring frost (32°F) is about Apr 24 and the first fall frost is about Oct 29, giving roughly a 190-day growing season. To be safe most years, wait until Apr 4 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 28 | May 11 | Apr 26 |
| Freeze (32°F) | May 9 | Apr 24 | Apr 4 |
| Hard (28°F) | Apr 17 | Mar 28 | Mar 5 |
| Severe (24°F) | Mar 25 | Mar 1 | Jan 29 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 28 | May 21 | May 17 | May 14 | May 11 | May 7 | May 4 | Apr 30 | Apr 26 |
| 32°F | May 9 | May 4 | Apr 30 | Apr 27 | Apr 24 | Apr 19 | Apr 15 | Apr 11 | Apr 4 |
| 28°F | Apr 17 | Apr 10 | Apr 5 | Mar 31 | Mar 28 | Mar 23 | Mar 17 | Mar 12 | Mar 5 |
| 24°F | Mar 25 | Mar 17 | Mar 10 | Mar 5 | Mar 1 | Feb 25 | Feb 18 | Feb 9 | Jan 29 |
| 20°F | Mar 8 | Feb 28 | Feb 21 | Feb 15 | Feb 6 | Jan 31 | Jan 19 | Jan 7 | Dec 27 |
| 16°F | Feb 22 | Feb 12 | Feb 1 | Jan 26 | Jan 16 | Jan 6 | Dec 31 | Dec 18 | Dec 7 |
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 28 | Oct 14 | Oct 29 |
| Freeze (32°F) | Oct 12 | Oct 29 | Nov 17 |
| Hard (28°F) | Oct 23 | Nov 17 | Dec 6 |
| Severe (24°F) | Nov 12 | Dec 5 | Jan 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 28 | Oct 3 | Oct 6 | Oct 10 | Oct 14 | Oct 17 | Oct 20 | Oct 24 | Oct 29 |
| 32°F | Oct 12 | Oct 18 | Oct 22 | Oct 25 | Oct 29 | Nov 1 | Nov 5 | Nov 10 | Nov 17 |
| 28°F | Oct 23 | Nov 1 | Nov 7 | Nov 11 | Nov 17 | Nov 21 | Nov 26 | Dec 1 | Dec 6 |
| 24°F | Nov 12 | Nov 21 | Nov 27 | Dec 1 | Dec 5 | Dec 10 | Dec 16 | Dec 24 | Jan 1 |
| 20°F | Nov 26 | Dec 2 | Dec 7 | Dec 14 | Dec 19 | Dec 27 | Jan 1 | Jan 9 | Jan 31 |
| 16°F | Dec 1 | Dec 6 | Dec 13 | Dec 20 | Dec 29 | Jan 2 | Jan 10 | Jan 23 | Feb 6 |
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: Upper Baker Dam, Wa, about 12.9 miles away@if(!empty($station['elevation_ft'])), at 690 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 Glacier, WA?
On average, the last spring frost (32°F) around Glacier, WA is about Apr 24. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 4.
When is the first frost in the fall?
The first fall frost around Glacier, WA typically arrives about Oct 29. 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 24 on average, or Apr 4 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 190 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 98244 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026