Castle Rock, CO Weather & Growing Conditions
Tonight
32°F
Mostly Clear
Mostly clear, with a low around 32. South wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 32°F | Mostly Clear | 3 mph S | 0% |
| Wednesday | 56°F | Mostly Sunny then Chance Rain Showers | 1 to 9 mph NNW | 44% |
| Wednesday Night | 34°F | Chance Rain And Snow Showers then Mostly Cloudy | 2 to 6 mph NW | 53% |
| Thursday | 56°F | Sunny | 1 to 5 mph NNE | 0% |
| Thursday Night | 34°F | Partly Cloudy | 2 to 8 mph S | 1% |
| Friday | 55°F | Sunny | 2 to 6 mph NNW | 8% |
| Friday Night | 33°F | Mostly Clear | 3 mph WSW | 8% |
| Saturday | 58°F | Sunny | 1 to 6 mph NNW | 3% |
| Saturday Night | 33°F | Clear | 1 to 7 mph SSE | 2% |
| Sunday | 68°F | Sunny | 2 to 9 mph S | 0% |
| Sunday Night | 39°F | Mostly Clear | 7 mph SW | 0% |
| Monday | 67°F | Sunny | 3 to 7 mph SSE | 0% |
| Monday Night | 40°F | Partly Cloudy | 5 to 8 mph SSW | 0% |
| Tuesday | 64°F | Mostly Sunny | 5 mph NNW | 6% |
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 (2.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.