Harman US

Speedway, IN Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Speedway, a town in Marion County, Indiana.

Overnight
66°F
Mostly Cloudy
Mostly cloudy. Low around 66, with temperatures rising to around 69 overnight. East southeast wind around 6 mph.

7-day forecast for Speedway

WhenTempForecastWindPrecip
Overnight 66°F Mostly Cloudy 6 mph ESE 7%
Saturday 88°F Slight Chance Showers And Thunderstorms 7 mph S 64%
Saturday Night 70°F Slight Chance Showers And Thunderstorms then Mostly Cloudy 6 mph S 23%
Sunday 85°F Chance Showers And Thunderstorms 3 to 7 mph W 40%
Sunday Night 63°F Showers And Thunderstorms Likely 10 mph NNE 61%
Monday 73°F Showers And Thunderstorms Likely 12 mph NE 61%
Monday Night 57°F Chance Showers And Thunderstorms 9 to 13 mph NE 46%
Tuesday 71°F Chance Showers And Thunderstorms 12 mph NE 38%
Tuesday Night 57°F Chance Showers And Thunderstorms then Mostly Cloudy 6 to 12 mph NE 26%
Wednesday 71°F Mostly Cloudy 6 to 9 mph NNE 7%
Wednesday Night 57°F Mostly Cloudy 5 to 9 mph N 5%
Thursday 73°F Partly Sunny 5 to 8 mph N 4%
Thursday Night 57°F Mostly Cloudy 3 to 8 mph NNE 4%
Friday 73°F Mostly Sunny 3 to 8 mph NNE 4%

Forecast source: National Weather Service (api.weather.gov) for Speedway (39.794, -86.248). Updated through the day.

Growing snapshot for Speedway

Last spring frost
Apr 12
First fall frost
Oct 29
Growing season
198 days
Hardiness zone
6b

More local growing data for Speedway: nearby ZIP 46224 weather · frost dates · planting calendar · Indiana frost dates

Nearby towns & communities

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Climate data from the nearest NOAA station, Indianapolis Eagle Creek Ap, In (2.9 mi from Speedway). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.