Why a Hard Freeze Hits Gwinnett's Warm-Season Lawns Harder Than You'd Expect

A hard freeze that barely registers as news in coastal Georgia can set back or kill sections of centipede and St. Augustine lawns across Gwinnett County, since both grasses are growing near the cold edge of what they can tolerate this far north in the state.

Why North Georgia Sees More of This

UGA Extension turfgrass specialist Clint Waltz has documented this pattern directly after severe cold events, noting that extended periods of single-digit temperatures cause real losses in common centipedegrass and in St. Augustine grass, which is especially common in shadier parts of metro Atlanta lawns. South Georgia lawns of the same grass types generally fare better simply because they don't see the same extended cold.

Why the Damage Isn't Always Obvious Right Away

The damage isn't always obvious until spring green-up either doesn't happen evenly or doesn't happen at all in affected sections. A lawn that looked fine going into winter can come out of it with dead patches that get mistaken for a disease or pest problem, when the actual cause was a cold snap months earlier.

Why Patience Matters More Than a Quick Fix

Waltz's guidance after a damaging freeze is specific: let a bermuda lawn green up on its own rather than forcing it with fertilizer, since warm temperatures combined with fertilizer can push the kind of soft new growth that's then vulnerable to a late frost. The same patience applies to winter-damaged centipede and St. Augustine, which need time to show the full extent of recovery before anyone assumes a section is dead and needs replacing.

What to Do Before Assuming the Worst

A county with multiple warm-season grass types growing near their cold tolerance limit sees this kind of damage more unevenly than a market further south. Confirming what actually died, rather than reseeding or resodding immediately after a cold winter, avoids replacing a lawn that would have recovered on its own by late spring.