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
98°F
Partly Sunny
Partly sunny, with a high near 98. Heat index values as high as 100. Southwest wind around 7 mph.
7-day forecast for Crystal Lake Park
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Partly Sunny | 7 mph SW | 2% |
| Tonight | 74°F | Partly Cloudy | 6 mph SW | 4% |
| Sunday | 93°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 6 mph W | 35% |
| Sunday Night | 68°F | Showers And Thunderstorms Likely | 8 mph NE | 67% |
| Monday | 78°F | Showers And Thunderstorms Likely | 6 to 9 mph NE | 67% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 6 to 9 mph N | 47% |
| Tuesday | 71°F | Slight Chance Rain Showers then Partly Sunny | 10 mph N | 21% |
| Tuesday Night | 55°F | Mostly Cloudy | 5 to 10 mph N | 3% |
| Wednesday | 73°F | Mostly Sunny | 8 mph N | 1% |
| Wednesday Night | 57°F | Partly Cloudy | 3 to 7 mph N | 0% |
| Thursday | 76°F | Mostly Sunny | 6 mph N | 1% |
| Thursday Night | 59°F | Partly Cloudy | 5 mph NE | 4% |
| Friday | 77°F | Mostly Sunny | 6 mph NE | 7% |
| Friday Night | 59°F | Partly Cloudy | 6 mph NE | 6% |
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
Nearby towns & communities
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Calverton Park
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Chesterfield
Clarkson Valley
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Cool Valley
Country Club Hills
Country Life Acres
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Dellwood
Des Peres
Edmundson
Ellisville
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 Sep 19, 2026.