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
43°F
Rain Showers
Rain showers. Cloudy. Low around 43, with temperatures rising to around 45 overnight. Northwest wind around 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Crystal Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 43°F | Rain Showers | 14 mph NW | 75% |
| Wednesday | 49°F | Rain Showers Likely | 17 mph WNW | 60% |
| Wednesday Night | 40°F | Rain Showers Likely | 12 to 15 mph WNW | 58% |
| Thursday | 48°F | Chance Rain Showers then Cloudy | 13 to 17 mph NNW | 32% |
| Thursday Night | 32°F | Mostly Cloudy | 5 to 12 mph N | 6% |
| Friday | 46°F | Mostly Sunny | 2 to 6 mph NNE | 2% |
| Friday Night | 26°F | Partly Cloudy | 1 mph NE | 1% |
| Saturday | 49°F | Mostly Sunny | 1 to 7 mph SW | 0% |
| Saturday Night | 32°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 55°F | Sunny | 7 mph W | 1% |
| Sunday Night | 34°F | Mostly Clear | 6 mph SW | 0% |
| Monday | 61°F | Sunny | 7 to 12 mph SW | 0% |
| Monday Night | 37°F | Mostly Clear | 2 to 6 mph WNW | 0% |
| Tuesday | 58°F | Mostly Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.