When to plant cantaloupes in New Hampshire
New Hampshire’s average last spring frost is May 13, and the first fall frost typically arrives around September 25 — about 135 frost-free days (USDA zones 3b, 4a, 4b, 5a, 5b, 6a). Cantaloupe / Muskmelon needs 70–90 days to mature, which fits comfortably within New Hampshire's growing season.
When to plant cantaloupes in New Hampshire: the short answer
For a spring planting, plant out May 20 – Jun 6, with seeds started indoors Apr 15 – Apr 29. Wait until the soil is at least 70°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 cantaloupes in New Hampshire, step by step
- Start seeds indoors (Apr 15 – Apr 29). Sow seeds 1 inch deep in seed-starting mix under bright light. They take 4-10 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 18 inches deep, with a pH between 6.0 and 7.5. Dig in compost before planting.
- Plant out (May 20 – Jun 6). Space plants about 24 inches apart in rows 60 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: striped cucumber beetle, aphids, squash bug, squash vine borer. Diseases and disorders: powdery mildew, downy mildew, fusarium wilt, bacterial wilt.
- Harvest (from about Aug 5 – Aug 25). Cantaloupe / Muskmelon takes 70-90 days to reach harvest. Needs 70-90 warm days - start indoors in paper pots in short-season areas. Ripe when the fruit slips from the vine with a light tug and smells sweet at the blossom end. Ease off water as fruit ripens for sugar.
Figures come from our crop data; dates use New Hampshire’s average frost dates. More in the full cantaloupe / muskmelon growing guide.
Cantaloupe planting dates by USDA zone in New Hampshire
New Hampshire spans USDA zones 3b, 4a, 4b, 5a, 5b, 6a. 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 cantaloupe / muskmelon dates shift with them.
When to plant cantaloupes in nearby states
| State | Last frost | Plant out |
|---|---|---|
| New Hampshire (this page) | May 13 | May 20 – Jun 6 |
| Maine | May 14 | May 21 – Jun 7 |
| Vermont | May 14 | May 21 – Jun 7 |
| Massachusetts | April 24 | May 1 – May 18 |
| Rhode Island | April 25 | May 2 – May 19 |
| Connecticut | April 25 | May 2 – May 19 |
| New York | May 1 | May 8 – May 25 |
Questions gardeners in New Hampshire ask
When is the best time to plant cantaloupes in New Hampshire?
Plant cantaloupe / muskmelon transplants outdoors in New Hampshire between May 20 and June 6. That timing is set by New Hampshire's average last spring frost of May 13.
When should I start cantaloupe / muskmelon seeds indoors in New Hampshire?
Start seeds indoors between April 15 and April 29, about 3 weeks before the last frost, so the seedlings are ready to plant out from May 20.
What is the latest I can plant cantaloupes in New Hampshire?
About July 17. Cantaloupes need at least 70 days to mature, and frost around September 25 ends the season, so later plantings risk being cut short.
When will cantaloupes planted in New Hampshire be ready to harvest?
Planted on time, cantaloupes are usually ready from about August 5 to August 25, 70-90 days after planting.
When is the last frost in New Hampshire?
On average around May 13, with the first fall frost around September 25 - about 135 frost-free days. Your town may differ by two weeks or more.