Frost dates in Cowlitz County, Washington
The average last spring frost in Cowlitz County falls Apr 1 to Apr 18 and the average first fall frost Oct 25 to Nov 18, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 8a to 8b. Places: Castle Rock, Kalama, Kelso, Longview, Ryderwood, Woodland. Pick a ZIP for 10% and 90% odds, soil temperature and the 7-day freeze forecast.
| ZIP | Place | Last spring frost | First fall frost | Zone |
|---|---|---|---|---|
| 98581 | Ryderwood | Apr 5 | Oct 25 | 8b |
| 98603 | Apr 1 | Nov 18 | 8b | |
| 98609 | Apr 8 | Nov 5 | 8b | |
| 98611 | Castle Rock | Apr 8 | Nov 5 | 8b |
| 98625 | Kalama | Apr 8 | Nov 5 | 8b |
| 98626 | Kelso | Apr 8 | Nov 5 | 8b |
| 98632 | Longview | Apr 8 | Nov 5 | 8b |
| 98645 | Apr 5 | Oct 25 | 8b | |
| 98649 | Apr 7 | Nov 13 | 8a | |
| 98674 | Woodland | Apr 18 | Nov 7 | 8b |
Nearby counties
Lewis County Wahkiakum County Clark County Skamania County Thurston County Pacific County
All Washington counties · Download Washington frost dates (CSV)
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