When to plant beets in Iowa
Iowa’s average last spring frost is April 25, and the first fall frost typically arrives around October 8 — about 166 frost-free days (USDA zones 4b, 5a, 5b). Beet needs 50–70 days to mature, which fits comfortably within Iowa's growing season.
When to plant beets in Iowa: the short answer
For a spring planting, sow Mar 23 – Apr 11. Seeds germinate in soil from 45 to 85°F.
Succession sow again in Iowa: Apr 15 · May 3 · May 21
Spring succession stops before summer heat makes it bolt. Start sowing again in late summer for a fall crop (see the fall window above).
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 beets in Iowa, step by step
- Prepare the bed. They need six or more hours of sun for the best growth, though four to six hours in partial shade is enough and loose soil at least 12 inches deep, with a pH between 6.0 and 7.5. Dig in compost before planting.
- Sow outdoors (Mar 23 – Apr 11). Space plants about 4 inches apart in rows 12 inches apart, sowing seed 0.75 inch deep. It handles frost well, so it can go out before the last frost date. As a cool-season crop it does best before summer heat arrives in Iowa.
- 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: leaf miner, flea beetle, aphids. Diseases and disorders: cercospora leaf spot, scab, damping off.
- Harvest (from about May 17 – Jun 6). Beet takes 50-70 days to reach harvest. Each wrinkled 'seed' is a cluster of 2-4 seedlings - thin to one or transplant the extras while tiny. Thinnings are edible greens.
Figures come from our crop data; dates use Iowa’s average frost dates. More in the full beet growing guide.
Beet planting dates by USDA zone in Iowa
Iowa spans USDA zones 4b, 5a, 5b. 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 beet dates shift with them.
When to plant beets in nearby states
Questions gardeners in Iowa ask
When is the best time to plant beets in Iowa?
Sow beets in Iowa between March 23 and April 11. That timing is set by Iowa's average last spring frost of April 25.
Can I plant beets in the fall in Iowa?
Yes. For a fall crop, sow between July 27 and August 13, so the crop matures in cool weather before Iowa's first frost around October 8.
When will beets planted in Iowa be ready to harvest?
Planted on time, beets are usually ready from about May 17 to June 6, 50-70 days after sowing.
When is the last frost in Iowa?
On average around April 25, with the first fall frost around October 8 - about 166 frost-free days. Your town may differ by two weeks or more.