2026 Underdown Trail Races

REGISTER FOR THE UNDERDOWN TRAIL RACES

AUGUST 15, 2026 - PRAIRIE DELLS TRAILHEAD - MERRILL, WISCONSIN

More details on the event website

Underdown Trail Run

Prairie Dells 60k ($95.00*) + Fees and Processing
9:30 am start
Heineman Hills Marathon ($80.00*) + Fees and Processing
10:15 am start
Oktoberfest Half Marathon ($60.00*) + Fees and Processing
11:30 am start

Thunderdown in the Underdown mountain bike

Long - Hundred Down (plus) ($75.00*) + Fees and Processing
8:00 am start with a midnight cutoff - Three laps totalling 110 miles - riders completing two laps will be scored after riders completing three laps.
Mid - Thunderdown ($60.00*) + Fees and Processing
9:00 am start - a single 37 mile lap
Short - Oktoberfest Summit ($55.00*) + Fees and Processing
9:15 am start - a single 16 mile lap

Name*

Email*

Phone Number*

Address*

Date of Birth*

Emergency Contact*

Emergency Contact Phone Number*

SMS opt-in*

I agree to receive SMS messages from the event organizer. I understand this is not a condition of purchase or registration, and I can opt out at any time by replying "UNSUBSCRIBE" to any received SMS message. Standard carrier messaging and data rates may apply
No, I would not like to receive text message notifications about the event

Age/Division (as of 8.15.26)*

Gender*

Male
Female

How do you hear about Underdown Trail Races?*

What is your top reason for doing this race?

Would you like to share your personal story/be interviewed

What is your "why"? Why do this ride? What challenges and motivates you? If you'd like to be featured on our social media sites, please check yes!

Event Release and Waiver of Liability*

I have read and agree to the terms above.

I agree to the terms above.*

Photo and Video Release*

I have read and agree to the terms above.

I agree to the terms above.*

Donation to IRONBULL (local non-profit )

$

Donation for Underdown Trails maintenance

$

Coupon Code

Total

$0.00

Give the gift of registration with a voucher for a friend

Amount$

Recipient Email

We will send an email with the voucher code. It will expire on August 20th, 2027.

Almost done. Where should we send the confirmation?

Email*

Name*

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