When to Plant Radish in New Hampshire

Growing Radish in New Hampshire: Complete Guide

Radish (Rhaphanus sativus) is a crop that grows best when sown directly in the garden. Depending on your zone, the right time to direct sow in New Hampshire falls between March 4, 2027 (Zone 6b) and April 3, 2027 (Zone 4a), once soil temperatures are consistently warm enough for germination.

Because New Hampshire stretches across 6 USDA hardiness zones (4a, 4b, 5a, 5b, 6a, 6b), planting windows can shift by as much as six to eight weeks from one end of the state to the other. Gardeners in the warmer southern zones can start earlier, while those in cooler northern zones should wait until the zone table above shows their last frost has passed.

With 25 days to maturity, Radish fits comfortably within New Hampshire's growing season in most zones. In the warmest parts of the state, a second planting later in the season may be possible.

Radish requires full sun to partial shade and regular (keep moist) moisture. In the Northeast, cool summers and moderate humidity can slow warm-season crops, so choose a sheltered, south-facing spot to maximise heat.

For the most precise planting dates tailored to your exact location, enter your ZIP code on our planting calendar or use the zone table above to find the schedule for your area of New Hampshire.