Delaware Half Marathon
Race Day Weather
Cool start — fast day potential, warming through the race
A cool 49°F at the start line is ideal for fast times — expect to warm up quickly once you're moving. Temperatures rising to 61°F through the course will gradually increase perceived effort in the second half. Light winds shouldn't be a major factor for pacing.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Delaware Half Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Get your personalized Delaware Half Marathon race plan
A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.
Race Info
The Delaware Half Marathon covers 13.1 miles through Wilmington, starting and finishing at Tubman-Garrett Riverfront Park. The route crosses Brandywine Park along the Brandywine River, follows tree-lined parkways and passes through historic neighborhoods, near the tower in Rockford Park and by Rodney Square downtown. It is the first half of the Delaware Marathon course, held on the same Sunday as the full marathon.
