When to plant · 23 cities · zones 6a–7a

When to plant tomatoes in Indiana

Start Roma Tomato seeds indoors around Mar 11 and transplant around Apr 29 — the Indiana statewide median, counted from a last spring frost of Apr 22 across 807 ZIP codes and 124 NOAA stations.

Mar 11Start indoors6 weeks before last frost
Apr 29Plant outApr 18 – May 5 across the state
Apr 22Last spring frostmedian · 1 in 10 years after May 7
Jul 13First harvest75 days from transplant

The rule: Six weeks indoors at 75–85 °F soil, then transplant a week after the last frost and cage at transplant.

Indiana tomatoes, by cultivar

Statewide median last frost Apr 22, first fall frost Oct 20, 2027 season. Each cultivar's own indoor lead time and days to maturity, same engine as the Plan Builder.

CultivarStart indoorsPlant outFirst harvestDays
Roma TomatoRoma VF (determinate paste)Mar 11Apr 29Jul 1375 from transplant
San Marzano TomatoSan Marzano (indeterminate paste)Mar 11Apr 29Jul 1880 from transplant

Tight means first harvest lands within two weeks of the median first fall frost. Statewide dates are the ZIP-weighted median of every NOAA 1991–2020 station Indiana's ZIP codes resolve to.

Tomatoes in Indiana, city by city

Roma Tomato, scheduled from each city's nearest NOAA station — the same dates as its frost page.

CityLast frostStart indoorsPlant outFirst harvest
Indianapoliszone 6bApr 20Mar 9Apr 27Jul 11
Fort Waynezone 6aApr 24Mar 13May 1Jul 15
Evansvillezone 7aApr 4Feb 21Apr 11Jun 25
Fisherszone 6aApr 21Mar 10Apr 28Jul 12
South Bendzone 6aMay 1Mar 20May 8Jul 22
Carmelzone 6aApr 21Mar 10Apr 28Jul 12
Bloomingtonzone 6bApr 15Mar 4Apr 22Jul 6
Hammondzone 6aApr 23Mar 12Apr 30Jul 14
Noblesvillezone 6aApr 21Mar 10Apr 28Jul 12
Lafayettezone 6aApr 26Mar 15May 3Jul 17
Greenwoodzone 6aApr 20Mar 9Apr 27Jul 11
Garyzone 6aApr 22Mar 11Apr 29Jul 13
Munciezone 6aApr 16Mar 5Apr 23Jul 7
Westfieldzone 6aApr 21Mar 10Apr 28Jul 12
Kokomozone 6aApr 27Mar 16May 4Jul 18
Terre Hautezone 6aApr 15Mar 4Apr 22Jul 6
Andersonzone 6aApr 19Mar 8Apr 26Jul 10
Elkhartzone 6aApr 26Mar 15May 3Jul 17
Jeffersonvillezone 7aMar 31Feb 17Apr 7Jun 21
Columbuszone 6bApr 11Feb 28Apr 18Jul 2
Mishawakazone 6aMay 1Mar 20May 8Jul 22
Lawrencezone 6aApr 18Mar 7Apr 25Jul 9
West Lafayettezone 6aApr 26Mar 15May 3Jul 17

What Indiana tomatoes need

SeedsThe cultivar decides the sauce. Everything downstream is damage control.
  • Roma Tomato Seed (300+)

    The determinate paste tomato: it ripens most of its crop inside a three-week window. That is a liability for eating and an enormous advantage for sauce day.

  • San Marzano Tomato SeedMust have

    The paste tomato Italian canners actually use. Low seed cavity, low water, high pectin: it reduces to a sauce in half the time a slicer takes and never tastes thin.

StartSoil temperature and light intensity, indoors, weeks before your frost date.
  • Organic Seed Starter Potting MixMust have

    Seed-starting mix is not potting soil with a nicer label — it is finer, lighter, and low in nutrients on purpose, because a seedling's first roots want air and moisture, not fertiliser.

  • Seedling Heat Mat + Digital ThermostatMust have

    Peppers germinate on soil temperature, not air temperature. At 65 °F a habanero takes a month and half of them rot; at 85 °F it is up in eight days. The thermostat is the half that matters.

  • T8 Full-Spectrum Grow Lights, 1 ft 4-packMust have

    A south window in March delivers a fraction of the light a pepper seedling needs, and the plant tells you by stretching. Two inches of LED above the canopy for 16 hours a day fixes it permanently.

  • 72-Cell Trays with 1020 Bottoms, 5-PackMust have

    The cheap black nursery trays crack after one season and flex enough to break roots when you lift them. These do not. Over five seasons the price per use is lower than the throwaways.

GrowRoot volume, nutrition and structure. Where most home crops actually fail.
  • 5-Gallon Fabric Grow Bags, 5-Pack

    Fabric pots air-prune roots and drain faster than a plastic pot can, which is the entire reason container tomatoes fail. Five gallons is the honest minimum for a pepper; a tomato wants ten.

  • Ocean Forest Potting SoilMust have

    Pre-charged with enough nutrition to carry a transplant for its first month without feeding, which is exactly the window when most container plants stall.

  • Organic Tomato-Tone 3-4-6 with 8% CalciumMust have

    The NPK ratio is the point: low nitrogen, higher potassium. Feed a tomato a high-nitrogen lawn fertiliser and you get a magnificent six-foot plant with four tomatoes on it.

  • Rot-Stop Blossom End Rot Concentrate

    Blossom end rot is almost never a soil calcium shortage — it is a calcium *transport* failure caused by inconsistent water. A foliar calcium spray buys time while you fix the watering, which is the real cure.

  • 58" Square Tomato Cages, 3-PackMust have

    The conical wire tomato ring from the hardware store is 33 inches tall and an indeterminate San Marzano will laugh at it in July. Height and square geometry are what actually hold a loaded plant.

  • Drip Irrigation System with Timer, 16 Nozzles

    Blossom end rot, split tomatoes and bitter fruit all trace back to the same thing: water that swings. A $50 timer removes the human from the loop and removes the swing.

ProtectFrost, hornworms, aphids, and the fungal pressure that follows a wet July.
  • Captain Jack Copper Fungicide, 16 oz

    Early blight and septoria arrive with a wet July and work up the plant from the bottom. Copper is preventative — sprayed after you see it, you are already losing.

  • Thuricide BT Concentrate, 16 oz

    Bacillus thuringiensis kills caterpillars and nothing else. For tomato hornworms — which can strip a plant in 48 hours — it is the most targeted tool that exists.

CookReduction, texture, and the non-reactive pans that keep tomato tasting like tomato.
  • Stainless Steel Food Mill, 3 discsMust have

    A blender pulverises tomato skins and seeds into the sauce, which is where bitterness comes from. A mill separates them out — no blanching, no peeling, no ice bath. It removes an entire hour from sauce day.

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Tomatoes in Indiana: questions

When should I plant tomatoes in Indiana?

Transplant around Apr 29 at the statewide median; across the state that date runs from Apr 18 in the warmest tenth of Indiana's ZIP codes to May 5 in the coldest. To cut the freeze risk to one year in ten, count from May 7 instead of the median last frost. Use the city table for your own town.

When do I start tomatoes seeds indoors in Indiana?

Around Mar 11 for Roma Tomato: 6 weeks before the statewide median last frost, on soil held at 75–85 °F.

When is the last frost in Indiana?

The ZIP-weighted median of NOAA 1991–2020 station medians is Apr 22. In the warmest tenth of Indiana's ZIP codes the median last frost falls on or before Apr 11; in the coldest tenth, on or after Apr 28.

When will Indiana tomatoes be ready to harvest?

Roma Tomato planted on the statewide date is ready around Jul 13: 75 days from transplant.

More for Indiana

Tomatoes in every state → · Indiana frost dates → · How frost-date math works →