Lyons, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lyons, a town in Boulder County, Colorado.
Overnight
52°F
Partly Cloudy
Partly cloudy, with a low around 52. West wind around 3 mph.
7-day forecast for Lyons
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Partly Cloudy | 3 mph W | 5% |
| Saturday | 74°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 6 mph S | 57% |
| Saturday Night | 47°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 mph W | 31% |
| Sunday | 70°F | Partly Sunny then Chance Showers And Thunderstorms | 3 mph NE | 29% |
| Sunday Night | 46°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 3 mph NNW | 26% |
| Monday | 70°F | Sunny | 0 to 6 mph ENE | 6% |
| Monday Night | 48°F | Partly Cloudy | 0 to 3 mph NNW | 10% |
| Tuesday | 74°F | Mostly Sunny | 0 to 3 mph ENE | 14% |
| Tuesday Night | 49°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph NNW | 18% |
| Wednesday | 76°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 3 mph ENE | 23% |
| Wednesday Night | 49°F | Partly Cloudy | 3 mph NW | 12% |
| Thursday | 77°F | Mostly Sunny | 2 to 6 mph SSW | 9% |
| Thursday Night | 52°F | Partly Cloudy | 0 to 3 mph SW | 11% |
| Friday | 77°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SSE | 19% |
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 Sep 19, 2026.