District of Columbia is transition-zone turf country — tall fescue and kentucky bluegrass alongside bermuda and zoysia. Click a city for its full month-by-month calendar.
| City | Aerate + overseed | Pre-emergent | Season |
|---|---|---|---|
| Washington | Sep 2 – Sep 17 | Mar 15 – Apr 5 | 210 days |
Across the 1 District of Columbia locations with complete 1991–2020 frost normals, the average last spring frost — the anchor for pre-emergent and spring work — ranges from Apr 5 (Washington) to Apr 5 (Washington). The same job can be weeks apart at opposite ends of the state, which is why a state-level date is only a starting point — pick the location nearest your yard and plan from its calendar.
District of Columbia lawns run on two opposite calendars. Tall fescue and bluegrass lawns treat early fall as the main event — aerate, overseed, feed — with spring for pre-emergent and light feeding. Bermuda and Zoysia lawns flip it: establish and feed from late spring through summer, stop nitrogen 6–8 weeks before frost, and accept winter brown as normal. Identify your grass first; every date on this page depends on it. Details by task: when to overseed in District of Columbia, when to aerate in District of Columbia, when to apply crabgrass pre-emergent in District of Columbia, and more above.