Event Information  Sunday April 19, 2026

ENTRIES are opening soon for 2026!      

Thanks to DCR Blue Hills Reservation for permitting this event !   

The 30th annual Trail Animals "Don't Run Boston" ultra marathons will be held on Sunday, April 19, 2026.    

- Still free.  Please donate to Mass Audubon Blue Hills Trailside Museum in lieu of an entry fee.   Also see donation policy for late withdrawals after entry.  

Here is the Facebook group for the race:  www.facebook.com/groups/215982452785525/

This is a rugged event with a good dose of steep rocky trails interspersed with quite runnable sections. 

 For those of you who don’t know this run, here is what you get for your low entry fee:

• A tough course with lots of turns and no markings.

• One manned aid station, visited 3 times, stocked by you (collective "you all" that is) and several fluid drops

• Lots of history- run continuously since 1997 this is by far the oldest TARC ultra event. It dates back to the true beginnings of the club before the social media and internet resurrection. 

A 50 mile run will start at 6 am.  

The 50K "event" has a start time of 8 am.  If you would like an early start you may start at 6 am.    Runners must complete the course by approx 7:30 pm. (Note actual cutoff time to be decided by permit and Ranger coverage)

Entry fee will be  $zero, however you will be asked to make a voluntary donation to "Blue Hills Trailside Museum" to support one of the important programs the Blue Hills offer to get people out in nature.   Click here for Museum Info

Signup will occur via a Google form (see below or the forms page.)

Entry plan:   Entries are limited.  See entry/forms page for details.  Entry confirmation will be required in April.

Aid drop / aid station assignments will be  determined in April.  

To enter go the entry/forms page: (Click here)