When to Plant in Indianapolis, IN

Indianapolis is centrally located in Indiana — Zone 6a with a typical last frost around April 18. The city's central location means it doesn't benefit from the lake effect moderation of northern Indiana or the warmer Ohio River valley of the south.

Indianapolis gardeners work with a solid 175-day growing season. Starting seeds indoors is important for tomatoes and peppers, and the city's community garden network makes urban growing increasingly accessible.

What to plant now in Indianapolis

Spring: After April 18 last frost — tomatoes, peppers, squash, beans, and cucumbers.
Early Spring (Mar–Apr): Cold-hardy crops — peas, lettuce, spinach, kale, and onion sets.
Fall: Broccoli, kale, lettuce, spinach, and carrots for October–November harvest.
Winter: Garlic planted in October overwinters. Planning and seed starting.

In Indianapolis (181 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.

Month by month in Indianapolis

Month	What to do
January	Order seeds. Plan garden layout.
February	Start tomato and pepper seeds indoors.
March	Direct sow peas and spinach. Start brassica transplants.
April	Transplant cold-hardy seedlings. After April 18 — plant warm-season crops.
May	Plant beans, squash, and cucumbers. Full spring garden.
June	Summer garden growing. Water consistently.
July	Harvest summer crops. Start fall seedlings.
August	Plant fall broccoli, kale, and cauliflower. Direct sow carrots.
September	Fall planting: lettuce and spinach.
October	First frost mid-October. Plant garlic.
November	Cold-hardy greens continue. Clean up beds.
December	Rest season. Plan next year.

Frost dates for Indianapolis ZIP codes

ZIP	Last spring frost (50%)	First fall frost (50%)	Zone
46227	April 18	October 16	6b
46224	April 18	October 16	6b
46229	April 18	October 16	6a
46236	April 22	October 17	6a

FAQ

When is the last frost date in Indianapolis, IN?

Indianapolis's average last frost date is around April 18. Start warm-season seeds indoors in early to mid-March.

What grows best in Indianapolis?

Cool-season crops in spring and fall: peas, lettuce, spinach, broccoli, and kale. Warm-season crops like tomatoes, peppers, beans, and squash produce well through summer.

When should I plant tomatoes in Indianapolis?

Start seeds indoors in mid-March. Transplant outdoors after October 16. Choose varieties that produce before the first fall frost around October 16.

How does Plan My Garden help Indianapolis gardeners?

Enter your Indianapolis zip code for exact planting dates tuned to central Indiana's growing calendar.