Castle Rock, CO Weather & Growing Conditions
Overnight
31°F
Partly Cloudy
Partly cloudy, with a low around 31. South southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 31°F | Partly Cloudy | 6 mph SSW | 0% |
| Wednesday | 53°F | Chance Rain Showers | 5 to 8 mph ESE | 40% |
| Wednesday Night | 32°F | Slight Chance Rain And Snow Showers | 3 to 7 mph NNW | 40% |
| Thursday | 54°F | Sunny | 5 mph NNW | 0% |
| Thursday Night | 34°F | Partly Cloudy | 3 to 10 mph SSW | 0% |
| Friday | 53°F | Mostly Sunny | 6 mph NW | 7% |
| Friday Night | 32°F | Mostly Clear | 3 mph W | 7% |
| Saturday | 55°F | Sunny | 5 mph N | 2% |
| Saturday Night | 33°F | Mostly Clear | 2 to 8 mph SSE | 0% |
| Sunday | 64°F | Sunny | 1 to 10 mph S | 0% |
| Sunday Night | 37°F | Mostly Clear | 5 to 9 mph SSW | 0% |
| Monday | 64°F | Sunny | 5 mph NNW | 0% |
| Monday Night | 38°F | Partly Cloudy | 5 mph S | 0% |
| Tuesday | 63°F | Mostly Sunny | 5 mph S | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Castle Rock, CO
Last spring frost
May 9
First fall frost
Oct 2
Growing season
143 days
Hardiness zone
5b
Explore more for Castle Rock, CO: full frost dates · planting calendar · Colorado frost dates
Climate data from the nearest NOAA station, Castle Rock, Co (8.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.