When to plant tomatoes in Kansas
Kansas’s average last spring frost is April 15, and the first fall frost typically arrives around October 20 — about 188 frost-free days (USDA zones 5b, 6a, 6b, 7a). Tomato needs 60–85 days to mature, which fits comfortably within Kansas's growing season.
When to plant tomatoes in Kansas: the short answer
For a spring planting, plant out Apr 15 – May 2, with seeds started indoors Feb 18 – Mar 4. Wait until the soil is at least 50°F and frost is over.
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow tomatoes in Kansas, step by step
- Start seeds indoors (Feb 18 – Mar 4). Sow seeds ¼ inch deep in seed-starting mix under bright light. They take 5-10 days to sprout, fastest in soil around 80°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. They need at least six to eight hours of direct sun a day and loose soil at least 18 inches deep, with a pH between 5.5 and 7.5. Dig in compost before planting.
- Plant out (Apr 15 – May 2). Space plants about 24 inches apart in rows 36 inches apart. It is killed by frost, so nothing goes outside until the danger has passed.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: tomato hornworm, aphids, whitefly, flea beetle. Diseases and disorders: early blight, late blight, septoria leaf spot, fusarium wilt, blossom-end rot (calcium disorder).
- Harvest (from about Jun 21 – Jul 16). Tomato takes 60-85 days to reach harvest. Days to maturity counted from transplant. Bury 2/3 of the stem at transplanting for extra roots. Determinate types suit containers and one big harvest; indeterminate types need staking and produce until frost.
Figures come from our crop data; dates use Kansas’s average frost dates. More in the full tomato growing guide.
Tomato planting dates by USDA zone in Kansas
Kansas spans USDA zones 5b, 6a, 6b, 7a. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the tomato dates shift with them.
When to plant tomatoes in nearby states
| State | Last frost | Plant out |
|---|---|---|
| Kansas (this page) | April 15 | Apr 15 – May 2 |
| North Dakota | May 15 | May 15 – Jun 1 |
| South Dakota | May 10 | May 10 – May 27 |
| Nebraska | April 30 | Apr 30 – May 17 |
| Oklahoma | April 1 | Apr 1 – Apr 18 |
Questions gardeners in Kansas ask
When is the best time to plant tomatoes in Kansas?
Plant tomato transplants outdoors in Kansas between April 15 and May 2. That timing is set by Kansas's average last spring frost of April 15.
When should I start tomato seeds indoors in Kansas?
Start seeds indoors between February 18 and March 4, about 7 weeks before the last frost, so the seedlings are ready to plant out from April 15.
What is the latest I can plant tomatoes in Kansas?
About August 21. Tomatoes need at least 60 days to mature after transplanting, and frost around October 20 ends the season, so later plantings risk being cut short.
When will tomatoes planted in Kansas be ready to harvest?
Planted on time, tomatoes are usually ready from about June 21 to July 16, 60-85 days after transplanting.
When is the last frost in Kansas?
On average around April 15, with the first fall frost around October 20 - about 188 frost-free days. Your town may differ by two weeks or more.