Spring Patching for Cool-Season Lawns in New Hampshire: Timing and Technique

Spring Patching for Cool-Season Lawns in New Hampshire: Timing and Technique

NH, patches, missed fall window. Late April to May is your spring window.

Procedure

1. Identify existing grass type (match the seed).
2. Rake patches loose, remove dead material.
3. Apply same-variety seed at overseeding rate.
4. Lightly rake in, firm with roller or foot.
5. Apply starter fertilizer (balanced NPK, per Scott’s label).
6. Keep moist until germination (10–21 days).

Coordination with Scott’s Program

If you use Scott’s 4-Step, Step 1 (crabgrass preventer) will kill new seed. Either skip Step 1 in patched areas, or delay seeding until fall. Fall is actually better for cool-season grasses in NH.

Match the seed. Prep the soil. Fertilize lightly. Avoid pre-emergent on new grass.