Castle Rock, CO Weather & Growing Conditions
Overnight
52°F
Partly Cloudy
Partly cloudy, with a low around 52. West wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Partly Cloudy | 3 mph W | 1% |
| Saturday | 75°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 8 mph SSW | 47% |
| Saturday Night | 50°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 to 6 mph S | 43% |
| Sunday | 70°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 9 mph NW | 40% |
| Sunday Night | 49°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 8 mph NW | 34% |
| Monday | 72°F | Sunny | 1 to 9 mph ESE | 6% |
| Monday Night | 50°F | Chance Showers And Thunderstorms | 10 mph SSE | 28% |
| Tuesday | 75°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 10 mph SE | 21% |
| Tuesday Night | 52°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 7 to 12 mph S | 19% |
| Wednesday | 76°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph SSE | 17% |
| Wednesday Night | 52°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 6 mph SSW | 19% |
| Thursday | 76°F | Mostly Sunny | 2 to 7 mph E | 13% |
| Thursday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 7 mph S | 20% |
| Friday | 77°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 10 mph S | 21% |
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 Sep 19, 2026.