Chesterfield Gorge Ultra

Chesterfield, MA, USA
31 May - 01 Jun, 2025 (Sat - Sun)

Trail running

11 km, 25 km, 50 km, 100 mi, 30 hrs

About the event

DAY OF REGISTRATION IS AVAILABLE!

Start Times:

100 mile - Saturday, 6:00am

100k, 50 mile - Saturday 7:00am

50k - Saturday, 8:00am 

100 mile relay - Satuday, noon

25k - Sunday, 8:00am 

*All ultra (non-50k) runners are still welcome to adjust their race distance if they desire (at any time!), staggered starts are simply to space out participant starts!  Only participants who start at the prescribed time will be eligible for awards, however you can request an alternative start time if traveling with someone starting earlier.*

Runners are also welcome to start at alternative times if necessary.  We'll be there for 30 hours, so we can be flexible!

More info:

This is a 'chose your own adventure' style run.  The race course starts at the Chesterfield Gorge Reservation, and is an out-and-back following the dirt road next to the river until Old Worthington Road where the turn-around aid station is located.  The entire course is on a rolling jeep dirt road (with enough rocks to be interesting, but not enough to be technical trail running).  There will be an aid station located halfway between the start/finish area (unmanned, water-only) and the turn-around aid station (manned and fully stocked).  Each manned aid station will have enthusiastic volunteers and standard aid station food/drink options.

Runners can do as much mileage as they want to within the 30-hour time limit by completing the following number of laps:

- 2 complete laps for the 50km race (See info below on the 50k!)

- 3 complete laps plus a shorter out-and-back for the 50 mile race

- 4 complete laps for the 100km race

- 6 complete laps plus a shorter out-and-back for the 100 mile race

(Runners may chose to stop and get credit for any full lap completed.)

25k runners have 4 hours to do 1 full lap of the race (and can request an earlier start if they think they'll need more time...we'll already be there!).

As always, ultrarunners will start on Saturday, and 25k runners will start on Sunday.

As is tradition, we are intentionally keeping things low-key...this is about enjoying some miles in a beautiful location, not about awards, giant buckles, or festivities.  There will, of course, be a small give-away and something special for 100 mile finishers, but don't expect anything fancy.  There may be small unanticipated changes between now and the race date.  

Further race information and details are found here.

Registration Details:

Since the Chesterfield Gorge Ultra & 25k is a nonprofit fundraising event (that supports the Hilltown Land Trust), registration fees are non-refundable and non-transferable due to registrants' inability to participate or in the event of cancellation due to circumstances beyond the control of race organizers.  We thank you for your anticipated understanding and support. 

Races offered by this event

You have 14 weeks to prepare

100 Mile Relay

31 May, 2025 (Sat)
Trail running

100 mi

Relay
On site
Trail

Ultra Race

31 May, 2025 (Sat)
Trail running

30 hrs

Solo
On site
Trail
Multiple loops

50k Race

31 May, 2025 (Sat)
Trail running

50 km

Solo
On site
Trail

25k Trail Race

01 Jun, 2025 (Sun)
Trail running

25 km

Solo
On site
Trail

11k Trail Race

01 Jun, 2025 (Sun)
Trail running

11 km

Solo
On site
Trail

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