When to plant chili 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). Chili Pepper needs 70–100 days to mature, which fits comfortably within North Dakota's growing season.
When to plant chili 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 65°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 chili 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 7-21 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 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 24 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, spider mite. Diseases and disorders: bacterial leaf spot, anthracnose, phytophthora blight.
- Harvest (from about Aug 7 – Sep 6). Chili Pepper takes 70-100 days to reach harvest. Superhots (C. chinense) can need 100+ days and the longest indoor start. Withholding some water late raises heat.
Figures come from our crop data; dates use North Dakota’s average frost dates. More in the full chili pepper growing guide.
Chili 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 chili pepper dates shift with them.
When to plant chili 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 chili peppers in North Dakota?
Plant chili 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 chili 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 chili peppers in North Dakota?
About July 12. Chili peppers need at least 70 days to mature after transplanting, and frost around September 20 ends the season, so later plantings risk being cut short.
When will chili peppers planted in North Dakota be ready to harvest?
Planted on time, chili peppers are usually ready from about August 7 to September 6, 70-100 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.