When to plant bush beans 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). Bush Bean needs 50–60 days to mature, which fits comfortably within Iowa's growing season.
When to plant bush beans in Iowa: the short answer
For a spring planting, sow Apr 27 – May 16. Wait until the soil is at least 60°F and frost is over.
Succession sow again in Iowa: May 16 · May 30 · Jun 13 · Jun 27 · Jul 11 · Jul 25
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 bush beans in Iowa, step by step
- 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 6.0 and 7.5. Dig in compost before planting.
- Sow outdoors (Apr 27 – May 16). Space plants about 4 inches apart in rows 18 inches apart, sowing seed 1.5 inches deep. 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: Mexican bean beetle, aphids, bean leaf beetle. Diseases and disorders: anthracnose, bacterial blight, bean rust, bean mosaic virus.
- Harvest (from about Jun 21 – Jul 1). Bush Bean takes 50-60 days to reach harvest. Do not start indoors - beans hate root disturbance. Sow every 2 weeks until ~10 weeks before first frost for a steady supply.
Figures come from our crop data; dates use Iowa’s average frost dates. More in the full bush bean growing guide.
Bush Bean 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 bush bean dates shift with them.
When to plant bush beans in nearby states
Questions gardeners in Iowa ask
When is the best time to plant bush beans in Iowa?
Sow bush beans in Iowa between April 27 and May 16. That timing is set by Iowa's average last spring frost of April 25.
Can I plant bush beans in the fall in Iowa?
Yes. For a fall crop, sow between July 13 and July 30, so the crop matures in cool weather before Iowa's first frost around October 8.
When will bush beans planted in Iowa be ready to harvest?
Planted on time, bush beans are usually ready from about June 21 to July 1, 50-60 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.