When to Plant Tomatoes in Cincinnati, OH
Set your conditions — the recommendation updates instantly.
GardenSays
Start tomato seeds indoors Mar 2 – Mar 16; transplant once frost danger is past and soil has warmed to ~60°F — typically Apr 27 – May 4 here.
- Start seeds indoors
- Mar 2 – Mar 16
- Transplant outside
- Apr 27 – May 4
- Last frost (typ.)
- Apr 20
In Cincinnati, OH, the typical last frost lands around Apr 20. Working back 6-8 weeks from transplant time gives you a seed-starting window of Mar 2 – Mar 16 indoors. Tomatoes are frost-tender, so wait for two conditions — frost danger past AND soil around 60°F — which here typically means Apr 27-May 4.
- This year's transplant window (Apr 27 – May 4) has passed — dates shown are for planning next season.
Do this this week
- 1.Passed for this season — plan next spring: start seeds indoors ~Mar 2 – Mar 16, transplant ~Apr 27 – May 4
Calculated result · 3 verified sources · Checked 2026-07-15 · How we decide
Why
That leaves roughly 174 days of growing season before the typical first fall frost (Oct 25) — enough for most varieties. In a short-season area, favor early-maturing varieties (check the days-to-maturity on the tag).
- Frost kills tender seedlings outright, and cold soil stunts them even without frost — both dates matter.
- The 50% frost date is a planning midpoint: a late frost is still possible, so keep covers handy for the first two weeks.
When this doesn't apply
- Season extenders (row covers, walls of water, cold frames) let you plant 2-3 weeks earlier than these windows.
- Frost dates are area averages — low spots and valley floors run colder than the local average.
How this was calculated
- 1. Last spring frostApr 20Source guidance
Cincinnati, OH: typical (50% probability) last 32°F frost
- 2. Seed starting windowMar 2 – Mar 16Calculated result
Tomato: start indoors 6-8 weeks before your typical transplant date
- 3. Transplant windowApr 27 – May 4Calculated result
Tomato is frost-tender: go out 7-14 days after the last frost, once soil reaches 60°F
- 4. First fall frostOct 25Source guidance
Cincinnati, OH: typical first 32°F frost in fall — the season's endpoint
Data sources
- University of Minnesota Extension — Growing tomatoes in home gardens — Start tomato seeds indoors about 6 weeks before the last frost; transplant after all danger of frost, once soil has warmed. (checked 2026-07-15)
- NOAA NCEI — 1991-2020 U.S. Climate Normals (freeze date probabilities) (checked 2026-07-15)
- National Gardening Association — frost date lookup (checked 2026-07-15)
What changes this answer
Starting from
Every change updates the answer, the math, the weekly steps and the share link instantly.
People also ask
What is the last frost date in Cincinnati?
Start tomato seeds indoors Mar 2 – Mar 16; transplant once frost danger is past and soil has warmed to ~60°F — typically Apr 27 – May 4 here. Calculate yours →
When should I start tomato seeds indoors?
Start tomato seeds indoors Mar 2 – Mar 16; transplant once frost danger is past and soil has warmed to ~60°F — typically Apr 27 – May 4 here. Calculate yours →
Your next decisions
More planting dates tools: see all →