Delaware Marathon

Wilmington, DE, USA · April 18, 2027·
partly-cloudy-day49°·60° high·Light·Dry
9
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Delaware Marathon race day weather

partly-cloudy-day
49°at start
64° high
Breezy
Dry
Your goal
0:00:00

Cool start, gradual warm-up

Runners will face a temperature rise from 49°F at the start to 60°F by the finish, with an average humidity of 52%. A light headwind during miles 2-3 and 5-8 may prompt pacing adjustments, particularly on the exposed sections. Runners should consider starting conservatively given the gradual temperature increase and adjust hydration frequency accordingly.

Race day forecast available in 141 days
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Pace Calculator

26.2mi
0:00:00
HH:MM:SS
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Delaware Marathon route and elevation

The Delaware Marathon course has about 630 ft (192 m) of climbing and 638 ft (194 m) of descent, and finishes near the elevation it starts. It is hillier than 69% of the marathon courses racecast.io has mapped, measured by what the hills cost in time. The hardest mile is mile 5, with 119 ft (36 m) of climbing and a 1.8% average grade.

Biggest climbs

  • Miles 3.7 to 5.1: climbs about 150 ft (45 m).
  • Miles 5.4 to 6.6: climbs about 100 ft (31 m).
  • Miles 12.1 to 12.7: climbs about 55 ft (17 m).

What the hills cost

  • 3:30 on a flat course is about 3:31 here (1 minute slower).
  • 4:00 on a flat course is about 4:02 here (2 minutes slower).
  • 4:30 on a flat course is about 4:32 here (2 minutes slower).

Hills only, priced mile by mile on the course map. The pace calculator above adds the race-day weather.

Even-effort splits for a 3:30, 4:00 or 4:30 finish
The Delaware Marathon mile splits at even effort for three finish times, with each mile's climb and descent
MileClimbDescent3:304:004:30
123 ft13 ft8:029:1110:20
233 ft21 ft8:039:1210:21
332 ft28 ft7:599:0810:16
459 ft18 ft8:189:2910:40
5119 ft22 ft8:4710:0211:18
635 ft32 ft8:009:0810:16
782 ft35 ft8:219:3310:44
827 ft28 ft7:579:0510:14
947 ft37 ft8:029:1110:20
107 ft84 ft7:408:459:51
1127 ft81 ft7:458:529:58
1221 ft92 ft7:418:479:53
1355 ft55 ft7:589:0610:14
149 ft24 ft7:549:0210:10
1514 ft20 ft7:569:0410:12
1622 ft13 ft8:029:1010:19
1724 ft5 ft8:079:1710:26
1812 ft14 ft7:579:0510:13
190 ft15 ft7:539:0210:10
206 ft10 ft7:579:0410:13
2120 ft7 ft8:049:1310:22
2218 ft0 ft8:069:1610:25
2317 ft40 ft7:529:0010:07
241 ft11 ft7:559:0310:11
2524 ft11 ft8:049:1310:22
263 ft19 ft7:549:0110:09
Last 0.23 ft2 ft1:462:012:16

Explore the Delaware Marathon course with the weather and your pace along the route, or compare it with other races.

Race Plan

Get your personalized Delaware 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 Pace
Weather Splits
Nutrition
Gear & Packing
T-Minus
Carb Tracker
Spectator Guide
Race Band

About the Delaware Marathon

The Delaware Marathon Running Festival is an excellent assembly of races for all ages and skill sets. Runners enjoy the best of Wilmington, from the majestic views along the riverfront and through downtown (which could be considered the financial center of the United States). The marathon is challenging, yet BQ-enabling and includes the scenic Jack Markell Trail. The half covers first 13 miles of the full marathon and the 10K and 5K run on the same day amplifies the race day buzz. All include access to brilliant post-race festivities in a beautiful park setting. Source

Race weekend

Sunday, April 18
7:00 AMMarathon (26.2 mi)
7:00 AMHalf Marathon (13.1 mi)7:00 AM10K (6.2 mi)
7:20 AM5K (3.1 mi)

Delaware Marathon FAQ

When is the 2027 Delaware Marathon?

The 2027 Delaware Marathon will be held on Sunday April 18, 2027.

Is the Delaware Marathon a Boston Marathon Qualifier?

Yes, the Delaware Marathon is an official Boston Marathon qualifier.

What is the time limit for the Delaware Marathon?

The time limit for the Delaware Marathon is 7 hours.

What will the weather be like for the 2027 Delaware Marathon?

The forecast calls for a high of 67°F and a low of 50°F with a 7% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

What is the elevation gain of the Delaware Marathon?

The Delaware Marathon course has about 630 ft (192 m) of climbing and 638 ft (194 m) of descent, and finishes near the elevation it starts. It is hillier than 69% of the marathon courses racecast.io has mapped, measured by what the hills cost in time.

Is the Delaware Marathon hilly?

Moderately. It has about 24 ft (7 m) of climbing per mile. The hardest mile is mile 5, with 119 ft (36 m) of climbing and a 1.8% average grade. 4:00 on a flat course is about 4:02 here (2 minutes slower).

What is the weather usually like for the Delaware Marathon?

Over the 22 years racecast.io has race-day weather for (2004 to 2026), it averaged 55°F at the start and 64°F by a typical finish. Rain fell during race hours in 4 of those years (2009, 2016, 2019 and 2026).

What was the hottest Delaware Marathon?

Of the 22 years on record, 2014 was the warmest, reaching 73°F during race hours. The coldest start was 2024, at 40°F.

What was the windiest Delaware Marathon?

Of the 22 years on record, 2009 was the windiest, with wind averaging 15 mph during race hours. The calmest was 2021, at 2 mph.

Delaware Marathon weather history

Based on 22 years of data
Avg Temp
59°F
L:54° H:64°
RunScore
7
Conditions
Rain Freq
18%
4 of 22 yrs
Wind8mph
Dew50°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScore
2026
cloudy
51°/55°Light
8
2025
fog
49°/54°-
10
2024
clear-day
40°/47°-
10
2023
clear-day
54°/65°-
7
2022
clear-day
54°/64°-
7
2021
clear-day
42°/63°-
9
2019
cloudy
56°/58°Light
9
2018
cloudy
49°/62°-
7
2017
clear-day
48°/60°-
9
2016
rain
53°/67°Light
7
2015
cloudy
64°/69°-
4
2014
clear-day
61°/73°-
6
2013
partly-cloudy-day
57°/64°-
7
2012
clear-day
58°/73°-
6
2011
cloudy
63°/66°-
5
2010
partly-cloudy-day
57°/66°-
8
2009
rain
55°/62°Light
7
2008
clear-day
55°/64°-
7
2007
clear-day
57°/66°-
7
2006
clear-day
47°/66°-
8
2005
partly-cloudy-day
63°/72°-
5
2004
partly-cloudy-day
66°/72°-
5