Fall · Lawn · Updated September 2026
Fall pre-emergent in Austin: why late September matters
Fall pre-emergent stops henbit, chickweed, and rescuegrass before they sprout. Here's when to put it down in Austin and what to do after.
The weeds that take over Austin lawns in January start in September. Henbit, chickweed, annual bluegrass, and rescuegrass all sprout in the fall, once nights cool off and the first rains soak in. By the time you notice them in a brown, dormant lawn, they've been growing for months.
When to put it down
In Central Texas, the fall window runs from late September to early October. Pre-emergent works by stopping seeds from sprouting. It does nothing to a weed that's already up, so timing is the whole game. Too early and it wears off before winter weeds finish sprouting. Too late and the first flush is already growing.
What our fall visit includes
Our fall treatment is a full PPF: post-emergent for weeds that are already up, pre-emergent to stop the next round, and fertilizer to help the lawn recover from summer. It's one visit, not three.
After the treatment
- Water pre-emergent in within 48 hours if it doesn't rain.
- Wait 48 hours before and after the treatment to mow.
- Keep people and pets off the lawn until it dries, usually 30 to 45 minutes.
Already seeing weeds?
If crabgrass, nutsedge, or dallisgrass took hold over the summer, the post-emergent part of the fall visit knocks them back. Nutsedge often needs a follow-up because it regrows from underground tubers.
