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Frost Dates for Indianapolis, Indiana, United States of America

Coordinates: 39.768, -86.158

Growing Season

The last spring air frost in Indianapolis, Indiana, United States of America typically occurs around Apr 16, and the first autumn air frost around Sep 28. This gives a frost-free growing season of approximately 165 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 6b, where the average annual extreme minimum temperature is -20.6 to -17.8°C (-5 to 0°F). This zone rating helps gardeners determine which perennial plants are likely to survive winter.

Temperature Overview

The coldest month is January, with an average low of -6°C (21°F). The warmest month is July, with an average high of 29°C (84°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Apr 16 (last spring) to Sep 28 (first autumn). Light ground frost (-1°C / 30°F): Apr 7 (last spring) to Oct 7 (first autumn). Hard ground frost (-2°C / 28°F): Mar 20 (last spring) to Oct 22 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 6b

... and the frost data for your area is ...

Current Risk Level: Unlikely (Safest)

for today based on past data only.

We predict a frost free growing season at your location from Apr 16 to Sep 28, which provides approximately 164 frost free days.

For the less tender plants, or if you are planning to protect your plants with fleece etc, your growing season could stretch from Apr 7 to Oct 7, which provides a total of 183 days for growing.

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