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
56°F
Cloudy
Cloudy. Low around 56, with temperatures rising to around 59 overnight. North northeast wind around 10 mph.
7-day forecast for Crystal Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Cloudy | 10 mph NNE | 14% |
| Sunday | 66°F | Chance Rain Showers | 12 to 16 mph NE | 28% |
| Sunday Night | 49°F | Chance Rain Showers | 13 mph ENE | 36% |
| Monday | 57°F | Rain Showers Likely | 9 to 13 mph ENE | 64% |
| Monday Night | 45°F | Rain Showers Likely then Mostly Cloudy | 5 to 9 mph NE | 64% |
| Tuesday | 60°F | Partly Sunny | 5 to 8 mph ENE | 8% |
| Tuesday Night | 43°F | Partly Cloudy | 2 to 6 mph E | 1% |
| Wednesday | 64°F | Mostly Sunny | 6 mph ESE | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 5 mph SE | 12% |
| Thursday | 66°F | Chance Rain Showers | 3 to 8 mph SE | 27% |
| Thursday Night | 53°F | Slight Chance Rain Showers | 5 mph SE | 18% |
| Friday | 70°F | Slight Chance Rain Showers then Mostly Cloudy | 2 to 6 mph SE | 15% |
| Friday Night | 55°F | Mostly Cloudy | 5 mph SE | 12% |
| Saturday | 69°F | Chance Rain Showers | 6 to 12 mph SSE | 28% |
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 Sep 20, 2026.