Lyons, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lyons, a town in Boulder County, Colorado.
Tonight
33°F
Mostly Clear
Mostly clear, with a low around 33. West wind around 2 mph.
7-day forecast for Lyons
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 33°F | Mostly Clear | 2 mph W | 0% |
| Wednesday | 56°F | Partly Sunny | 0 to 5 mph NE | 7% |
| Wednesday Night | 32°F | Mostly Cloudy | 3 mph NW | 9% |
| Thursday | 58°F | Sunny | 0 to 6 mph SSE | 0% |
| Thursday Night | 34°F | Partly Cloudy | 1 to 5 mph W | 1% |
| Friday | 58°F | Mostly Sunny | 1 to 5 mph S | 12% |
| Friday Night | 32°F | Mostly Clear | 2 to 6 mph WSW | 12% |
| Saturday | 60°F | Sunny | 0 to 9 mph SSE | 1% |
| Saturday Night | 33°F | Mostly Clear | 1 to 6 mph W | 0% |
| Sunday | 67°F | Sunny | 1 to 7 mph SSW | 0% |
| Sunday Night | 40°F | Mostly Clear | 5 to 12 mph W | 0% |
| Monday | 67°F | Mostly Sunny | 0 to 8 mph SE | 0% |
| Monday Night | 39°F | Partly Cloudy | 3 mph W | 0% |
| Tuesday | 65°F | Mostly Sunny | 3 mph E | 6% |
Forecast source: National Weather Service (api.weather.gov) for Lyons (40.223, -105.269). Updated through the day.
Growing snapshot for Lyons
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a
More local growing data for Lyons: nearby ZIP 80503 weather · frost dates · planting calendar · Colorado frost dates
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Climate data from the nearest NOAA station, Longmont 2 Ese, Co (7 mi from Lyons). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.