Harman US

Castle Rock, CO Weather & Growing Conditions

This Afternoon
74°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3pm, then showers and thunderstorms. Partly sunny. High near 74, with temperatures falling to around 65 in the afternoon. East wind around 7 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 74°F Chance Showers And Thunderstorms 7 mph E 78%
Tonight 47°F Chance Showers And Thunderstorms then Partly Cloudy 2 to 6 mph SSW 43%
Sunday 68°F Sunny then Slight Chance Showers And Thunderstorms 5 to 9 mph NNW 23%
Sunday Night 47°F Chance Showers And Thunderstorms 1 to 7 mph SW 41%
Monday 70°F Mostly Sunny 2 to 10 mph SE 6%
Monday Night 50°F Slight Chance Showers And Thunderstorms then Partly Cloudy 10 to 17 mph SSE 17%
Tuesday 75°F Mostly Sunny then Slight Chance Showers And Thunderstorms 5 to 17 mph SSE 18%
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%
Friday Night 51°F Chance Rain Showers 8 to 12 mph S 32%

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.