Alamosa, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alamosa, a city in Alamosa County, Colorado.
Overnight
53°F
Patchy Smoke
Patchy smoke. Partly cloudy, with a low around 53. South southwest wind 10 to 15 mph.
7-day forecast for Alamosa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Patchy Smoke | 10 to 15 mph SSW | 0% |
| Tuesday | 89°F | Patchy Smoke then Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 22% |
| Tuesday Night | 53°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 15 mph SE | 13% |
| Wednesday | 89°F | Sunny | 5 to 15 mph SSW | 8% |
| Wednesday Night | 49°F | Mostly Clear | 5 to 10 mph N | 2% |
| Thursday | 91°F | Sunny | 5 to 10 mph NNW | 4% |
| Thursday Night | 51°F | Mostly Clear | 5 to 20 mph SE | 2% |
| Friday | 91°F | Sunny | 5 to 10 mph N | 0% |
| Friday Night | 53°F | Mostly Clear | 15 mph SSE | 1% |
| Saturday | 91°F | Sunny | 5 mph W | 1% |
| Saturday Night | 53°F | Partly Cloudy | 15 to 20 mph SSE | 2% |
| Sunday | 91°F | Sunny | 5 mph SE | 5% |
| Sunday Night | 54°F | Partly Cloudy | 10 to 15 mph S | 9% |
| Monday | 90°F | Sunny | 5 to 10 mph NE | 9% |
Forecast source: National Weather Service (api.weather.gov) for Alamosa (37.475, -105.877). Updated through the day.
Growing snapshot for Alamosa
Last spring frost
May 30
First fall frost
Sep 17
Growing season
108 days
Hardiness zone
4b
More local growing data for Alamosa: nearby ZIP 81101 weather · frost dates · planting calendar · Colorado frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Alamosa 1E, Co (0.2 mi from Alamosa). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.