Crystal Lake Park, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Crystal Lake Park, a city in St. Louis County, Missouri.
Today
60°F
Slight Chance Drizzle then Mostly Cloudy
A slight chance of drizzle before noon. Mostly cloudy, with a high near 60. West wind 7 to 12 mph.
7-day forecast for Crystal Lake Park
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 60°F | Slight Chance Drizzle then Mostly Cloudy | 7 to 12 mph W | 12% |
| Tonight | 46°F | Partly Cloudy | 6 mph W | 0% |
| Thursday | 64°F | Sunny | 6 to 10 mph W | 0% |
| Thursday Night | 48°F | Mostly Cloudy | 6 mph NW | 4% |
| Friday | 57°F | Partly Sunny | 9 mph N | 2% |
| Friday Night | 38°F | Partly Cloudy | 2 to 6 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 37°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 61°F | Sunny | 5 mph NW | 1% |
| Sunday Night | 38°F | Clear | 2 mph W | 0% |
| Monday | 66°F | Sunny | 3 mph SW | 0% |
| Monday Night | 44°F | Clear | 5 mph SW | 0% |
| Tuesday | 68°F | Sunny | 3 mph W | 1% |
| Tuesday Night | 45°F | Mostly Clear | 1 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Crystal Lake Park (38.621, -90.432). Updated through the day.
Growing snapshot for Crystal Lake Park
Last spring frost
Apr 4
First fall frost
Oct 29
Growing season
206 days
Hardiness zone
7a
More local growing data for Crystal Lake Park: nearby ZIP 63131 weather · frost dates · planting calendar · Missouri frost dates
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Climate data from the nearest NOAA station, St Charles 7 Ssw, Mo (6.5 mi from Crystal Lake Park). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.