Castle Rock, WA Weather & Growing Conditions
Today
54°F
Patchy Fog then Light Rain Likely
Patchy frost before 8am, then patchy fog between 9am and 10am, then rain likely. Mostly cloudy. High near 54, with temperatures falling to around 52 in the afternoon. South southeast wind 1 to 5 mph. Chance of precipitation is 70%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 54°F | Patchy Fog then Light Rain Likely | 1 to 5 mph SSE | 67% |
| Tonight | 43°F | Light Rain | 3 to 10 mph S | 94% |
| Thursday | 53°F | Slight Chance Light Rain then Mostly Sunny | 0 to 3 mph S | 22% |
| Thursday Night | 40°F | Patchy Fog then Chance Light Rain | 0 to 5 mph SSE | 54% |
| Friday | 52°F | Light Rain Likely | 3 to 9 mph SSE | 67% |
| Friday Night | 44°F | Light Rain Likely | 6 mph SSE | 59% |
| Saturday | 59°F | Partly Sunny then Chance Light Rain | 3 mph S | 27% |
| Saturday Night | 46°F | Light Rain | 3 to 14 mph S | 80% |
| Sunday | 52°F | Chance Light Rain | 0 to 8 mph SSW | 53% |
| Sunday Night | 38°F | Slight Chance Light Rain | 1 mph ENE | 15% |
| Monday | 52°F | Chance Light Rain | 3 mph SE | 38% |
| Monday Night | 43°F | Chance Light Rain | 2 to 12 mph SSE | 49% |
| Tuesday | 54°F | Chance Light Rain | 3 to 12 mph SSE | 49% |
| Tuesday Night | 45°F | Chance Light Rain | 3 to 9 mph SSE | 47% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Castle Rock, WA
Last spring frost
Apr 5
First fall frost
Oct 25
Growing season
196 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, Toledo Faa Ap, Wa (10.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.