Crystal Lake, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Crystal Lake, a city in Hancock County, Iowa.
Overnight
64°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy. Low around 64, with temperatures rising to around 67 overnight. South southwest wind around 8 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Crystal Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Chance Showers And Thunderstorms | 8 mph SSW | 51% |
| Tuesday | 72°F | Showers And Thunderstorms Likely | 7 to 12 mph NW | 55% |
| Tuesday Night | 55°F | Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 7 mph NW | 46% |
| Wednesday | 73°F | Mostly Sunny | 3 mph N | 2% |
| Wednesday Night | 53°F | Mostly Clear | 3 mph SE | 1% |
| Thursday | 79°F | Sunny | 2 to 7 mph S | 0% |
| Thursday Night | 59°F | Mostly Clear | 8 mph S | 4% |
| Friday | 82°F | Sunny | 6 to 14 mph S | 10% |
| Friday Night | 64°F | Chance Showers And Thunderstorms | 7 to 12 mph S | 25% |
| Saturday | 85°F | Slight Chance Showers And Thunderstorms then Sunny | 6 to 13 mph S | 15% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 13 mph SSW | 33% |
| Sunday | 84°F | Chance Showers And Thunderstorms then Mostly Sunny | 12 mph SE | 33% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 7 to 10 mph SE | 33% |
| Monday | 83°F | Chance Showers And Thunderstorms | 13 mph E | 33% |
Forecast source: National Weather Service (api.weather.gov) for Crystal Lake (43.223, -93.793). Updated through the day.
Growing snapshot for Crystal Lake
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
More local growing data for Crystal Lake: nearby ZIP 50432 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Britt 3E, Ia (8.6 mi from Crystal Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.