Trail running course through mixed terrain in Wisconsin, USA
Arctic Frog Run

Arctic Frog Run — 25K

25K·177 ft gain·Mayville, Wisconsin
trailloopbeginner friendly

AI-generated image

Distance25K
Gain177 ft
DateAnnual · Dec
Difficulty2/5

Registration is closed for Arctic Frog Run — 25K

Get alerted if spots open up or when next year's registration goes live.

About This Race

At 25K, runners experience the Arctic Frog's winter trail character in a substantial but manageable format. The 417-foot elevation profile offers enough variation to engage experienced trail runners while remaining approachable for those building toward longer distances. This mid-distance option captures the event's December atmosphere without the full commitment of ultramarathon mileage.

The Arctic Frog Run utilizes a loop-based course that's approximately 70% asphalt and 30% crushed limestone trail. All distances share the same basic loop structure, with the 15K covering 2 loops of 4.65 miles each, while the longer distances use 6 or 10 loops of a 5.17-mile circuit. The course offers scenic panoramic views of Mayville and features rolling terrain with moderate elevation gains.

The mixed surface provides variety underfoot, transitioning between paved sections and crushed limestone trail segments. The loop format allows runners and crews to plan strategically, with multiple opportunities for support and pacing adjustments. An interactive course map is available through the race website, showing the yellow-marked route direction.

Elevation Profile

Elevation profile estimated from terrain data. Actual course may differ.

The course gains 177 ft over 16 miles, with the steepest section between mile 17–mile 17.

Location

Practical Info

Weather

December conditions in Wisconsin typically range from cold to potentially snowy, with temperatures likely below freezing and possible winter precipitation.

Nearest Airport

MKE - Milwaukee Mitchell International Airport

Accommodation

Mayville is a small Wisconsin city with limited lodging options. Milwaukee, about 45 miles southeast, offers more accommodation choices.

Best For

First-time ultra runnersWinter running enthusiastsLoop-course strategists

Notable Features

The Arctic Frog Run's defining characteristic is its December timing, which often transforms the southeastern Wisconsin landscape into what organizers call a 'winter wonderland.' The loop-based format creates a supportive environment for runners attempting their first ultra, while the mixed terrain of asphalt and crushed limestone provides enough variety to keep longer distances engaging. The race's eleven-year history demonstrates its reliability as a winter running option.

Other Distances at This Event

15K

702 ft gain

The Arctic Frog Run utilizes a loop-based course that's approximately 70% asphalt and 30% crushed limestone trail. All distances share the same basic loop structure, with the 15K covering 2 loops of 4.65 miles each, while the longer distances use 6 or 10 loops of a 5.17-mile circuit. The course offers scenic panoramic views of Mayville and features rolling terrain with moderate elevation gains. The mixed surface provides variety underfoot, transitioning between paved sections and crushed limestone trail segments. The loop format allows runners and crews to plan strategically, with multiple opportunities for support and pacing adjustments. An interactive course map is available through the race website, showing the yellow-marked route direction.

50K

1,371 ft gain

The Arctic Frog Run utilizes a loop-based course that's approximately 70% asphalt and 30% crushed limestone trail. All distances share the same basic loop structure, with the 15K covering 2 loops of 4.65 miles each, while the longer distances use 6 or 10 loops of a 5.17-mile circuit. The course offers scenic panoramic views of Mayville and features rolling terrain with moderate elevation gains. The mixed surface provides variety underfoot, transitioning between paved sections and crushed limestone trail segments. The loop format allows runners and crews to plan strategically, with multiple opportunities for support and pacing adjustments. An interactive course map is available through the race website, showing the yellow-marked route direction.

50 Miles

417 ft gain

The Arctic Frog Run utilizes a loop-based course that's approximately 70% asphalt and 30% crushed limestone trail. All distances share the same basic loop structure, with the 15K covering 2 loops of 4.65 miles each, while the longer distances use 6 or 10 loops of a 5.17-mile circuit. The course offers scenic panoramic views of Mayville and features rolling terrain with moderate elevation gains. The mixed surface provides variety underfoot, transitioning between paved sections and crushed limestone trail segments. The loop format allows runners and crews to plan strategically, with multiple opportunities for support and pacing adjustments. An interactive course map is available through the race website, showing the yellow-marked route direction.