Understanding Spring Lawn Dormancy and Green-Up Timing

Normal Dormancy Break

Cool-season lawns (NJ, fescue/bluegrass) break dormancy when soil temps reach 50–55°F consistently. Air temps lag. Mid-April = early stages.

Factors Affecting Timing

• Microclimate: South-facing, slopes green first. North-facing, shaded lag.
• Grass type: Perennial ryegrass earliest, then tall fescue, then Kentucky bluegrass.
• Fall management: Late fertilizing = earlier green-up.

What to Do Now

• Be patient. Don't overwater or overfertilize.
• Light rake to remove dead blades if matted.
• Apply pre-emergent crabgrass preventer if not done (soil 55°F).

Expectation

By mid-May, with normal temps, lawn should be fully green and growing. ChemLawn's assessment is likely correct.

When to Worry

If still 50% brown by June 1, investigate: grubs, disease, soil compaction, wrong grass type.