Alamosa, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alamosa, a city in Alamosa County, Colorado.
This Afternoon
75°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 2pm and 4pm. Mostly sunny, with a high near 75. Southwest wind 10 to 15 mph.
7-day forecast for Alamosa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 11% |
| Tonight | 37°F | Mostly Clear | 5 to 15 mph S | 2% |
| Sunday | 75°F | Sunny | 0 to 15 mph SW | 1% |
| Sunday Night | 35°F | Mostly Clear | 5 to 15 mph NW | 0% |
| Monday | 74°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 37°F | Partly Cloudy | 5 to 10 mph S | 0% |
| Tuesday | 72°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 15 mph SSW | 29% |
| Tuesday Night | 42°F | Chance Showers And Thunderstorms | 15 mph S | 50% |
| Wednesday | 69°F | Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 10 mph S | 39% |
| Wednesday Night | 41°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 10 mph SSE | 16% |
| Thursday | 70°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph SW | 22% |
| Thursday Night | 41°F | Chance Showers And Thunderstorms | 5 to 10 mph SSE | 51% |
| Friday | 68°F | Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 10 mph S | 51% |
| Friday Night | 40°F | Chance Showers And Thunderstorms | 10 mph S | 37% |
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 Sep 20, 2026.