Calhan, CO Weather & Growing Conditions
Today
74°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between noon and 2pm, then a chance of showers and thunderstorms between 2pm and 3pm, then a chance of showers and thunderstorms between 3pm and 5pm, then showers and thunderstorms likely. Mostly sunny, with a high near 74. South southeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSE | 56% |
| Tonight | 48°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 to 10 mph NNW | 61% |
| Sunday | 68°F | Mostly Sunny then Showers And Thunderstorms Likely | 5 to 10 mph SSW | 67% |
| Sunday Night | 47°F | Showers And Thunderstorms | 5 to 10 mph E | 81% |
| Monday | 67°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph S | 19% |
| Monday Night | 48°F | Showers And Thunderstorms Likely | 15 to 20 mph SSE | 58% |
| Tuesday | 69°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 15 mph S | 11% |
| Tuesday Night | 49°F | Chance Showers And Thunderstorms then Mostly Cloudy | 15 mph SSE | 39% |
| Wednesday | 73°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 10 mph S | 15% |
| Wednesday Night | 51°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 10 mph SSW | 23% |
| Thursday | 74°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph NNE | 11% |
| Thursday Night | 52°F | Chance Showers And Thunderstorms | 5 to 10 mph SSE | 26% |
| Friday | 73°F | Mostly Sunny then Chance Showers And Thunderstorms | 10 to 15 mph S | 26% |
| Friday Night | 52°F | Chance Rain Showers | 10 to 15 mph S | 31% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Calhan, CO
Last spring frost
May 9
First fall frost
Oct 4
Growing season
146 days
Hardiness zone
5b
Explore more for Calhan, CO: full frost dates · planting calendar · Colorado frost dates
Climate data from the nearest NOAA station, Rush 1N, Co (15.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.