Castle Rock, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castle Rock, a city in Cowlitz County, Washington.
Today
92°F
Areas Of Smoke
Areas of smoke after 10am. Sunny, with a high near 92. North wind around 3 mph.
7-day forecast for Castle Rock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 92°F | Areas Of Smoke | 3 mph N | 0% |
| Tonight | 60°F | Smoke | 3 mph N | 0% |
| Wednesday | 97°F | Areas Of Smoke | 3 mph N | 0% |
| Wednesday Night | 60°F | Mostly Clear | 2 mph NNW | 0% |
| Thursday | 96°F | Sunny | 2 mph NW | 0% |
| Thursday Night | 57°F | Mostly Clear | 2 mph WNW | 0% |
| Friday | 90°F | Sunny | 3 mph WNW | 0% |
| Friday Night | 55°F | Mostly Clear | 3 mph WNW | 0% |
| Saturday | 85°F | Sunny | 3 mph WNW | 0% |
| Saturday Night | 53°F | Mostly Clear | 3 mph WNW | 0% |
| Sunday | 80°F | Mostly Sunny | 3 mph NW | 0% |
| Sunday Night | 52°F | Mostly Clear | 3 mph NW | 0% |
| Monday | 80°F | Mostly Sunny | 3 mph NNW | 0% |
| Monday Night | 52°F | Partly Cloudy | 3 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Castle Rock (46.272, -122.904). Updated through the day.
Growing snapshot for Castle Rock
Last spring frost
Apr 8
First fall frost
Nov 5
Growing season
210 days
Hardiness zone
8b
More local growing data for Castle Rock: nearby ZIP 98611 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Longview, Wa (10.7 mi from Castle Rock). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.