Castle Rock, WA Weather & Growing Conditions
Today
92°F
Areas Of Smoke
Areas of smoke after 10am. Sunny, with a high near 92. North wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 92°F | Areas Of Smoke | 6 mph N | 0% |
| Tonight | 60°F | Smoke | 6 mph N | 0% |
| Wednesday | 97°F | Areas Of Smoke | 5 mph N | 0% |
| Wednesday Night | 59°F | Mostly Clear | 0 to 3 mph NNW | 0% |
| Thursday | 95°F | Sunny | 0 to 5 mph NW | 0% |
| Thursday Night | 56°F | Mostly Clear | 1 to 5 mph WNW | 0% |
| Friday | 90°F | Sunny | 1 to 5 mph WNW | 0% |
| Friday Night | 55°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Saturday | 85°F | Sunny | 0 to 6 mph NNW | 0% |
| Saturday Night | 53°F | Mostly Clear | 0 to 6 mph NW | 0% |
| Sunday | 79°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Sunday Night | 52°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Monday | 79°F | Mostly Sunny | 0 to 5 mph NNW | 0% |
| Monday Night | 52°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Castle Rock, WA
Last spring frost
Apr 8
First fall frost
Nov 5
Growing season
210 days
Hardiness zone
8b
Explore more for Castle Rock, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Longview, Wa (10.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.