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Registration closed January 16, 2015
Obtain a GPS transmitter for an extra level of security and the option for friends and family to track your progress during the event. The $50 cost is well worth their peace of mind while you are out in the elements. This will be the only option for participant tracking.
Rod McLennan
Race Director
Karen McLennan
Race Director
Volunteer Coordinator

Saturday, January 18, 2014 - 10:00am

No additional details at this time.

Check-in, pre-race briefing, and start are all at the Mauthe Lake Recreation Area in the Kettle Moraine State Forest Northern Unit.

The race course follows the Ice Age National Scenic Trail through the entire distance of the forest. Racers will complete two out-and-backs. The first takes them to the Northern most point and back, followed by the Southern most point and back.

Gear is staged near the ranger station at the Mauthe Lake entrance.

Frozen Otter Wisconsin


  1. All participants must stay on the Ice Age Trail marked by the yellow blaze. Racers caught traveling on road or other trails will be disqualified.
  2. All garbage must be placed in DNR garbage cans, checkpoint trash bags, or packed out.
  3. No outside support or gear staging is allowed. Spectators are allowed at designated checkpoints but may not provide any type of support. Pacers are allowed at any point, but must not provide any type of support either.
  4. Required gear must be carried at ALL times! Failure to pass a gear check during the race will result in IMMEDIATE disqualification and the participant will be shuttled back to the start/finish.
  5. Please respect other people using the trail. The Ice Age Trail is open to the public for the duration of the event.
  6. All vehicles must have a Wisconsin State Parks sticker
  7. Racers must notify volunteers of both their arrival and departure from EVERY manned checkpoint.
  8. PLEASE notify race staff if you decide not continue at any point
  9. All racers must be back to Butler Lake no later than 24 hours (12 Hours for Half Distance racers) from the race start to be considered an official finisher.
  10. All participants must traverse the course using only their feet with no additional gear such as snowshoes, skis, motorized transport, etc. Traction devices such as Yaktrax and crampons are allowed.

Information not currently available

How do I sign up to volunteer?

Volunteer SignUp the Frozen Otter 2021:

Are pacers allowed?

Pacers are allowed at any point during the race due to the increased level of safety they provide. They may not provide ANY support other than moral support. This is a self-supported event, not a pacer supported event.

How Do I Transfer a Bib?

The bib transfer process is now fully automated. The parties involved are solely responsible for payment transfer and confirmation. The process is as follows:

1. The recipient must have an account on the website
2. The current bib owner should log in and navigate to the event page.
3. The current bib owner will see an option to either view the 'want' list or 'transfer registration'

- Click on the 'View "Want" List' button
- Click 'transfer' under the Actions column

- Click on the 'Transfer Registration' button
- Enter the email address of the recipient (must be the one they registered with)

Upon completion, the registration will appear under the new users account. This can be verified by viewing the participant list.

Is there a medical check for participants?

There is no medical check during the event. The volunteers will do their best to keep an eye on the state of the participants, but are not expected to, nor qualified to make any medical judgements. It is the responsibility of the racers to access their condition and decide if they are able to continue. Race staff will have the right to pull any racer out if they feel they are a danger to themselves. All racers are required to carry a cellular phone to activate the 911 system if needed.

Can I stage gear or have a support crew?

Support is only allowed at the central staging area at Mauthe Lake. Participants may leave a drop bin/bag at the 46 mile Mauthe Lake checkpoint. Any spectators providing support beyond what is being provided by the volunteer staff to all racers will disqualify that racer.

What qualifies as the required shelter?

Starting in 2020, the extreme gear shelter requirement has been replaced by a 3-4 season bivy instead. This is due to the confusion surrounding what would qualify as a shelter as well as the safety concerns around being able to pitch a shelter in an emergency. Emergency bivys do not qualify. You may, however, carry the 3-4 season bivy as a replacement for the otherwise required emergency bivy when extreme weather gear is not required.

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