When to plant bell peppers in North Dakota
North Dakota’s average last spring frost is May 15, and the first fall frost typically arrives around September 20 — about 128 frost-free days (USDA zones 3a, 3b, 4a, 4b). Bell Pepper needs 60–90 days to mature, which fits comfortably within North Dakota's growing season.
When to plant bell peppers in North Dakota: the short answer
For a spring planting, plant out May 22 – Jun 8, with seeds started indoors Mar 13 – Mar 27. Wait until the soil is at least 60°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 bell peppers in North Dakota, step by step
- Start seeds indoors (Mar 13 – Mar 27). Sow seeds ¼ inch deep in seed-starting mix under bright light. They take 7-14 days to sprout, fastest in soil around 82°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 12 inches deep, with a pH between 5.5 and 7.0. Dig in compost before planting.
- Plant out (May 22 – Jun 8). Space plants about 18 inches apart in rows 30 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: aphids, flea beetle, pepper maggot, tomato hornworm. Diseases and disorders: bacterial leaf spot, anthracnose, blossom-end rot (calcium disorder), phytophthora blight.
- Harvest (from about Jul 28 – Aug 27). Bell Pepper takes 60-90 days to reach harvest. Needs warm soil; wait until nights stay above 55 F to transplant. Green peppers are just unripe coloured peppers left another 2-3 weeks.
Figures come from our crop data; dates use North Dakota’s average frost dates. More in the full bell pepper growing guide.
Bell Pepper planting dates by USDA zone in North Dakota
North Dakota spans USDA zones 3a, 3b, 4a, 4b. 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 bell pepper dates shift with them.
When to plant bell peppers in nearby states
| State | Last frost | Plant out |
|---|---|---|
| North Dakota (this page) | May 15 | May 22 – Jun 8 |
| South Dakota | May 10 | May 17 – Jun 3 |
| Nebraska | April 30 | May 7 – May 24 |
| Kansas | April 15 | Apr 22 – May 9 |
| Oklahoma | April 1 | Apr 8 – Apr 25 |
Questions gardeners in North Dakota ask
When is the best time to plant bell peppers in North Dakota?
Plant bell pepper transplants outdoors in North Dakota between May 22 and June 8. That timing is set by North Dakota's average last spring frost of May 15.
When should I start bell pepper seeds indoors in North Dakota?
Start seeds indoors between March 13 and March 27, about 8 weeks before the last frost, so the seedlings are ready to plant out from May 22.
What is the latest I can plant bell peppers in North Dakota?
About July 22. Bell peppers need at least 60 days to mature after transplanting, and frost around September 20 ends the season, so later plantings risk being cut short.
When will bell peppers planted in North Dakota be ready to harvest?
Planted on time, bell peppers are usually ready from about July 28 to August 27, 60-90 days after transplanting.
When is the last frost in North Dakota?
On average around May 15, with the first fall frost around September 20 - about 128 frost-free days. Your town may differ by two weeks or more.