When to Plant Crocus in New Hampshire

Growing Crocus in New Hampshire: Complete Guide

Crocus (Crocus vernus) is fall-planted — it goes in the ground a few weeks before the first fall frost and overwinters for blooms the following spring. Depending on your zone, New Hampshire gardeners plant between July 30, 2026 (Zone 4a) and August 29, 2026 (Zone 6b).

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 150 days to maturity, Crocus 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.

Crocus requires full sun to part shade and moderate 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.