Castle Rock, CO Weather & Growing Conditions
Overnight
50°F
Partly Cloudy
Partly cloudy, with a low around 50. West southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Partly Cloudy | 5 mph WSW | 2% |
| Saturday | 72°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 8 mph SW | 50% |
| Saturday Night | 48°F | Chance Showers And Thunderstorms then Partly Cloudy | 6 mph S | 44% |
| Sunday | 68°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph WNW | 47% |
| Sunday Night | 47°F | Chance Showers And Thunderstorms | 2 to 7 mph NW | 42% |
| Monday | 69°F | Mostly Sunny | 2 to 10 mph SE | 7% |
| Monday Night | 49°F | Chance Showers And Thunderstorms | 10 to 16 mph SSE | 34% |
| Tuesday | 71°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 16 mph SSE | 21% |
| Tuesday Night | 50°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 13 mph S | 24% |
| Wednesday | 73°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 3 to 10 mph S | 17% |
| Wednesday Night | 50°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 6 mph SSW | 23% |
| Thursday | 72°F | Mostly Sunny | 2 to 7 mph ENE | 14% |
| Thursday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph S | 22% |
| Friday | 73°F | Mostly Sunny then Chance Showers And Thunderstorms | 10 mph S | 25% |
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 Sep 19, 2026.