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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.