Lyons, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lyons, a town in Boulder County, Colorado.
Overnight
56°F
Patchy Smoke
Patchy smoke and a slight chance of rain showers. Mostly cloudy. Low around 56, with temperatures rising to around 58 overnight. Northeast wind around 7 mph. Chance of precipitation is 20%.
7-day forecast for Lyons
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Patchy Smoke | 7 mph NE | 17% |
| Tuesday | 76°F | Patchy Smoke | 8 mph E | 16% |
| Tuesday Night | 52°F | Patchy Smoke | 3 to 8 mph NE | 10% |
| Wednesday | 84°F | Patchy Smoke | 2 to 8 mph ENE | 2% |
| Wednesday Night | 53°F | Mostly Clear | 2 to 7 mph S | 1% |
| Thursday | 93°F | Sunny | 2 to 7 mph NNE | 1% |
| Thursday Night | 58°F | Mostly Clear | 3 to 8 mph NW | 1% |
| Friday | 95°F | Sunny | 2 to 9 mph S | 0% |
| Friday Night | 59°F | Mostly Clear | 5 to 9 mph WNW | 0% |
| Saturday | 98°F | Sunny | 3 to 9 mph NNE | 6% |
| Saturday Night | 62°F | Partly Cloudy | 5 to 8 mph W | 1% |
| Sunday | 96°F | Sunny | 3 to 7 mph N | 10% |
| Sunday Night | 64°F | Partly Cloudy | 8 mph WNW | 6% |
| Monday | 95°F | Mostly Sunny then Chance Showers And Thunderstorms | 8 mph NNW | 31% |
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 Aug 4, 2026.