Castle Rock, WA Weather & Growing Conditions
Overnight
37°F
Patchy Fog
Patchy fog before 3am. Mostly clear. Low around 37, with temperatures rising to around 39 overnight. South southeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 37°F | Patchy Fog | 2 mph SSE | 2% |
| Wednesday | 56°F | Patchy Frost then Light Rain Likely | 2 to 7 mph S | 70% |
| Wednesday Night | 44°F | Light Rain | 3 to 9 mph S | 94% |
| Thursday | 56°F | Slight Chance Light Rain then Partly Sunny | 1 to 6 mph S | 20% |
| Thursday Night | 42°F | Areas Of Fog then Chance Light Rain | 0 to 5 mph SSE | 54% |
| Friday | 55°F | Light Rain Likely | 5 to 13 mph SSE | 67% |
| Friday Night | 46°F | Light Rain Likely | 5 mph SSE | 57% |
| Saturday | 62°F | Partly Sunny then Chance Light Rain | 6 mph S | 28% |
| Saturday Night | 48°F | Light Rain | 5 to 12 mph S | 81% |
| Sunday | 55°F | Chance Light Rain | 0 to 7 mph SSW | 49% |
| Sunday Night | 40°F | Slight Chance Light Rain | 1 mph NE | 15% |
| Monday | 55°F | Chance Light Rain | 1 to 5 mph SE | 37% |
| Monday Night | 45°F | Chance Light Rain | 2 to 9 mph SSE | 49% |
| Tuesday | 56°F | Chance Light Rain | 3 to 10 mph SSE | 49% |
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 Nov 4, 2026.