Rend Lake Marathon

Whittington, IL, USA · March 27, 2027·
partly-cloudy-day46°·58° high·Breezy·Dry
9
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Rend Lake Marathon race day weather

partly-cloudy-day
46°at start
62° high
Breezy
Dry
Your goal
0:00:00

Cool start, warming finish

Runners will face temperatures starting at 46°F and rising to 58°F by midday, with light winds from the south at 9 mph. The humidity is moderate at 55%, so runners should consider adjusting their pace as they warm up. The toughest conditions will occur in miles 8-11 with headwinds, while miles 19-23 will benefit from a tailwind, making it crucial to strategize pacing accordingly.

Race day forecast available in 122 days
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Pace Calculator

26.2mi
0:00:00
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Rend Lake Marathon route and elevation

The Rend Lake Marathon course has about 1,042 ft (318 m) of climbing and 1,042 ft (318 m) of descent, and finishes near the elevation it starts. It is hillier than 55% of the marathon courses racecast.io has mapped, measured by what the hills cost in time. The hardest mile is mile 9, with 108 ft (33 m) of climbing and a 1.6% average grade.

Biggest climbs

  • Miles 1.8 to 2: climbs about 55 ft (16 m).
  • Miles 8 to 9: climbs about 90 ft (27 m).
  • Miles 14.5 to 20.5: climbs about 105 ft (31 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 4:01 here (1 minute slower).
  • 4:30 on a flat course is about 4:31 here (1 minute 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 Rend Lake Marathon mile splits at even effort for three finish times, with each mile's climb and descent
MileClimbDescent3:304:004:30
152 ft33 ft8:069:1610:26
296 ft38 ft8:279:3910:51
362 ft80 ft7:539:0110:08
449 ft65 ft7:549:0110:09
550 ft54 ft7:579:0510:13
646 ft43 ft7:599:0710:16
752 ft60 ft7:559:0410:11
851 ft80 ft7:518:5810:06
9108 ft21 ft8:429:5611:10
1046 ft102 ft7:448:519:58
1150 ft44 ft8:019:0910:17
1249 ft75 ft7:518:5810:06
1317 ft39 ft7:529:0010:08
1463 ft48 ft8:059:1510:23
1559 ft29 ft8:139:2210:33
1612 ft15 ft7:579:0610:14
1721 ft20 ft7:589:0610:14
1831 ft25 ft8:019:1010:19
1926 ft20 ft8:009:0910:17
2020 ft13 ft8:019:1010:19
2140 ft17 ft8:099:1910:29
2244 ft93 ft7:468:529:59
2343 ft33 ft8:039:1210:20
2416 ft40 ft7:528:5910:07
2564 ft37 ft8:119:2110:31
2624 ft53 ft7:508:5710:05
Last 0.210 ft23 ft1:421:572:11

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

Race Plan

Get your personalized Rend Lake 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 Rend Lake Marathon

Gorgeous paved paths, stunning views and rolling country roads make this course the Marathon to remember!

Rend Lake, IL, located in the heart of southern Illinois, is a natural haven for wildlife and a recreational haven for visitors. Rend Lake consists of 18,900 acres of water and 20,000 acres of land. Campers will delight in the nearly 800 sites found in 5 public campgrounds on Rend Lake. Boaters are provided access to the lake through the numerous boat ramps. Beaches, picnic sites and trails provide the perfect backdrop for outdoor fun.

The course then will take you across the lake for one of the best panoramic views in Illinois, before connecting to the bike path which passes South Sandusky Beach, the Marina, Rend Lake Visitors Center, the amazing spillway and dozens of other spectacular views of Rend Lake. From there you will continue on country roads winding through beautiful vistas including both Lake Hamilton and Lake Benton. Finally you will get back on the bike path and end at the stunning North Marcum Beach.

We can't wait to see you finish your next great adventure with us!
Source

Race weekend

Saturday, March 27
8:30 AMMarathon (26.2 mi)
9:30 AMHalf Marathon (13.1 mi)9:30 AM1/4 Marathon (6.6 mi)

Rend Lake Marathon FAQ

When is the 2027 Rend Lake Marathon?

The 2027 Rend Lake Marathon will be held on Saturday March 27, 2027.

Is the Rend Lake Marathon a Boston Marathon Qualifier?

Yes, the Rend Lake Marathon is an official Boston Marathon qualifier.

What is the time limit for the Rend Lake Marathon?

The time limit for the Rend Lake Marathon is 7 hours.

What will the weather be like for the 2027 Rend Lake Marathon?

The forecast calls for a high of 64°F and a low of 45°F with a 13% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

What is the elevation gain of the Rend Lake Marathon?

The Rend Lake Marathon course has about 1,042 ft (318 m) of climbing and 1,042 ft (318 m) of descent, and finishes near the elevation it starts. It is hillier than 55% of the marathon courses racecast.io has mapped, measured by what the hills cost in time.

Is the Rend Lake Marathon hilly?

Moderately. It has about 40 ft (12 m) of climbing per mile. The hardest mile is mile 9, with 108 ft (33 m) of climbing and a 1.6% average grade. 4:00 on a flat course is about 4:01 here (1 minute slower).

What is the weather usually like for the Rend Lake Marathon?

Over the 4 years racecast.io has race-day weather for (2022 to 2026), it averaged 48°F at the start and 54°F by a typical finish. It has not rained during race hours in any of those years.

What was the hottest Rend Lake Marathon?

Of the 4 years on record, 2025 was the warmest, reaching 71°F during race hours. The coldest start was 2026, at 35°F.

What was the windiest Rend Lake Marathon?

Of the 4 years on record, 2023 was the windiest, with wind averaging 17 mph during race hours. The calmest was 2026, at 6 mph.

Rend Lake Marathon weather history

Based on 4 years of data
Avg Temp
51°F
L:47° H:54°
RunScore
8
Conditions
Rain Freq
0%
0 of 4 yrs
Wind12mph
Dew34°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
clear-day
35°/48°-
10
2025
cloudy
66°/71°-
5
2023
cloudy
48°/50°-
9
2022
clear-day
41°/48°-
9