Castle Rock, WA Weather & Growing Conditions
Tonight
49°F
Mostly Cloudy then Patchy Fog
Patchy fog after midnight. Mostly cloudy, with a low around 49. North wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Mostly Cloudy then Patchy Fog | 1 mph N | 0% |
| Saturday | 78°F | Patchy Fog then Partly Sunny | 3 mph N | 0% |
| Saturday Night | 49°F | Partly Cloudy | 3 mph N | 0% |
| Sunday | 79°F | Mostly Sunny | 3 mph N | 0% |
| Sunday Night | 49°F | Mostly Clear then Patchy Fog | 3 mph NNW | 0% |
| Monday | 75°F | Patchy Fog then Mostly Sunny | 1 to 5 mph NW | 0% |
| Monday Night | 49°F | Partly Cloudy then Patchy Fog | 3 mph NW | 0% |
| Tuesday | 72°F | Patchy Fog then Partly Sunny | 3 mph NW | 1% |
| Tuesday Night | 47°F | Partly Cloudy then Patchy Fog | 0 to 3 mph NNW | 1% |
| Wednesday | 71°F | Patchy Fog then Mostly Sunny | 1 mph N | 1% |
| Wednesday Night | 49°F | Partly Cloudy | 1 mph N | 4% |
| Thursday | 73°F | Partly Sunny | 2 mph N | 10% |
| Thursday Night | 50°F | Slight Chance Light Rain | 2 mph W | 23% |
| Friday | 68°F | Slight Chance Light Rain then Partly Sunny | 3 mph WSW | 20% |
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 Sep 19, 2026.