Indiana spans several USDA planting (hardiness) zones, roughly from Zone 5b up to Zone 7a, depending on where you are in the state.

Quick Scoop: Indiana’s Planting Zones

  • Northern Indiana: Mostly Zone 5b and 6a, including many areas near the Michigan border.
  • Central Indiana: Largely Zone 6a and 6b, which covers cities like Indianapolis and surrounding counties.
  • Southern Indiana: Primarily Zone 6b, with the warmest pockets down along and below I‑64 now classified as Zone 7a.

In everyday terms, Indiana’s planting zone range is 5b–7a, so for the most accurate answer you’d look up your specific city or ZIP code to see where you fall within that band.

“If you garden in Indiana, you’re almost certainly in USDA Zone 5b, 6a, 6b, or 7a—your exact spot just depends on how far north or south you are.”

TL;DR: What planting zone is Indiana?
Indiana is in USDA planting zones 5b–7a, with cooler zones in the north and warmer zones in the far south.

Information gathered from public forums or data available on the internet and portrayed here.