Quick answer
First fix the cause (shade, traffic, compaction, drainage, or pests), then fill the spot with sod or seed suited to the grass type and season.
Find the Cause
- Heavy foot or dog traffic
- Too much shade for Bermuda
- Compacted clay soil
- Standing water
- Grub or disease damage
Repair Options
Warm-season grasses like Bermuda fill best with sod plugs or patches in late spring and summer. Fescue patches are best seeded in fall.
Prep the Soil
Loosen the soil, add a little compost, level the area, and keep new grass moist until it roots.