When to plant cucumbers in Minnesota
Minnesota’s average last spring frost is May 6, and the first fall frost typically arrives around September 28 — about 145 frost-free days (USDA zones 3a, 3b, 4a, 4b, 5a). Cucumber needs 50–70 days to mature, which fits comfortably within Minnesota's growing season.
When to plant cucumbers in Minnesota: the short answer
For a spring planting, plant out May 13 – May 30, with seeds started indoors Apr 8 – Apr 22. Wait until the soil is at least 60°F and frost is over.
Succession sow again in Minnesota: Jun 10 · Jul 1 · Jul 22
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 cucumbers in Minnesota, step by step
- Start seeds indoors (Apr 8 – Apr 22). Sow seeds 1 inch deep in seed-starting mix under bright light. They take 3-10 days to sprout, fastest in soil around 85°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 14 inches deep, with a pH between 5.5 and 7.0. Dig in compost before planting.
- Plant out (May 13 – May 30). Space plants about 12 inches apart in rows 48 inches apart. It is killed by frost, so nothing goes outside until the danger has passed.
- Water and feed. It needs plenty of water; keep the soil evenly moist and never let it dry out.
- Watch for pests and problems. Pests: striped cucumber beetle, squash bug, aphids, spider mite. Diseases and disorders: powdery mildew, downy mildew, bacterial wilt, angular leaf spot.
- Harvest (from about Jul 9 – Jul 29). Cucumber takes 50-70 days to reach harvest. Resents root disturbance - if starting indoors use peat/paper pots. Trellising doubles the plants per square foot and cuts disease. A second sowing in midsummer beats early beetle pressure.
Figures come from our crop data; dates use Minnesota’s average frost dates. More in the full cucumber growing guide.
Cucumber planting dates by USDA zone in Minnesota
Minnesota spans USDA zones 3a, 3b, 4a, 4b, 5a. 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 cucumber dates shift with them.
When to plant cucumbers in nearby states
Questions gardeners in Minnesota ask
When is the best time to plant cucumbers in Minnesota?
Plant cucumber transplants outdoors in Minnesota between May 13 and May 30. That timing is set by Minnesota's average last spring frost of May 6.
When should I start cucumber seeds indoors in Minnesota?
Start seeds indoors between April 8 and April 22, about 3 weeks before the last frost, so the seedlings are ready to plant out from May 13.
Can I plant cucumbers in the fall in Minnesota?
Yes. For a fall crop, sow between June 26 and July 13, so the crop matures in cool weather before Minnesota's first frost around September 28.
When will cucumbers planted in Minnesota be ready to harvest?
Planted on time, cucumbers are usually ready from about July 9 to July 29, 50-70 days after planting.
When is the last frost in Minnesota?
On average around May 6, with the first fall frost around September 28 - about 145 frost-free days. Your town may differ by two weeks or more.