Harman US

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

WhenTempForecastWindPrecip
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.