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Harpers Ferry, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Harpers Ferry, a city in Allamakee County, Iowa.

This Afternoon
70°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 5pm, then showers and thunderstorms likely. Cloudy. High near 70, with temperatures falling to around 66 in the afternoon. East wind around 3 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

7-day forecast for Harpers Ferry

WhenTempForecastWindPrecip
This Afternoon 70°F Chance Showers And Thunderstorms 3 mph E 55%
Tonight 57°F Showers And Thunderstorms Likely 6 mph NE 67%
Sunday 71°F Slight Chance Rain Showers then Mostly Cloudy 9 mph NE 22%
Sunday Night 51°F Mostly Cloudy 5 to 8 mph NE 11%
Monday 65°F Chance Rain Showers 7 mph NE 49%
Monday Night 48°F Chance Rain Showers 2 to 6 mph NE 49%
Tuesday 64°F Slight Chance Rain Showers then Partly Sunny 2 to 6 mph NE 16%
Tuesday Night 45°F Partly Cloudy 1 to 5 mph NE 3%
Wednesday 67°F Mostly Sunny 3 mph NE 2%
Wednesday Night 49°F Partly Cloudy 2 mph NE 0%
Thursday 69°F Partly Sunny then Slight Chance Rain Showers 1 mph E 15%
Thursday Night 53°F Slight Chance Rain Showers then Mostly Cloudy 0 mph 15%
Friday 73°F Partly Sunny 1 mph NE 5%
Friday Night 53°F Partly Cloudy 0 mph 3%

Forecast source: National Weather Service (api.weather.gov) for Harpers Ferry (43.201, -91.152). Updated through the day.

Growing snapshot for Harpers Ferry

Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
175 days
Hardiness zone
5a

More local growing data for Harpers Ferry: nearby ZIP 52146 weather · frost dates · planting calendar · Iowa frost dates

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Climate data from the nearest NOAA station, Lynxville Dam 9, Wi (5.9 mi from Harpers Ferry). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.