Rochester Orienteering Club

Mendon Trail Run - A Trail Run for Everyone!

Since 1994, The Rochester Orienteering Club has offered The Mendon Trail Run. The Mendon Trail Run raises funds to support the activities of the Club, which is one of the most active Orienteering Clubs in the US (to learn more, or to attend one of our events, see https://rochesterorienteering.org/).

This year's distances and estimated climbs:

• 50K - 4750 ft of climb
• Half marathon (21.1K) - 2000 ft of climb
• 10K - 950 ft of climb
• 5K - 450 ft of climb

Aid station for 1/2 Marathon, 50k, and 10K runners is about 3.5 miles into the loop, plus one water stop in the S/F area.

Course Description

10 km loop course is entirely on trails or grassy fields. The course will be marked, turns marked at trail junctions, and traffic cones at the road crossing. The course has many rolling hills. Nearly all of the course is runnable (not particularly technical), although there is one fairly short rocky downhill section where the footing can be a little tricky. Estimated 950 feet of climb per 10k loop. It should be noted that the total elevation difference between low point and high point on the course is only 300 feet; it should also be noted that the course is essentially never flat! There will be two crossings of park roads per loop. Runners are responsible for their own safety when crossing roads.

Half Marathon logistics

The half marathon will start at 9 am, using the same starting line as the other distances (very close to race headquarters). Runners will do a 1.1 km loop, which will end at the finish line, at which point the runners will do two 10K loops, to give the 21.1 km half marathon distance.

5K course

The 5K course starts at 9:45 am, using the same starting line as the other distances, except the runners will go off in the opposite direction. (They will not do the short loop that passes the open shelter on the hill.) From that point, the course is the same as the 10K loop for the first 3.7 km, then splits off to head back.

click here for Course Map

Meet Information Sheet

Paper entry form (for race day paper entries)

Pacer waiver  2025 50K Results  30K Results  20K Results  10K Results

Event Information

Aid station for 10K, Half Marathon, and 50K runners at start/finish, plus one water stop about 3.5 miles into loop.
Pacers will be permitted in the 50K only, and only for the last two loops. There is no charge for pacers, but we require that you fill out a waiver. See the registration table for the waiver. There are several rules for pacers, most of which are common in ultras:

• Pacers can't carry supplies for the runner (they can't carry the runner's Camelbak if they have one, for example; they can't carry their water bottle, or food for them, etc.)
  
• Since we won't be charging for pacers, pacers are not allowed to take supplies for himself/herself at the aid stations.
  
• The pacer can't run through the finish line with the runner, either at the end of the race or when finishing a lap.
  
• The pacer must arrive at the aid station with the runner or after the runner, and must leave the aid station with the runner or before the runner. So the pacer can't race ahead and be filling the runner's water bottle, rounding up food items, etc., or linger after the runner has left the aid station.
  

Refunds: Full refund minus 20% administration fee up to October 03. No refunds after that date.

Contact: Race Director

Race Start Times:

2025 Entry Fees	By Oct 02	Oct. 3 - Nov. 5	Nov 06, or  day of event
5k	$30	$35	$40
10k	$30	$35	$40
Half Marathon	$45	$50	$55
50k	$65	$70	$75

50K cutoff:

The last loop must be started before 2:30 PM and course must be completed by 4:00pm to ensure race is finished by dark. 

Aid Station for 2026

Due to County Park health regulations, in some instances, food may need to be handed to you. There will be one fully stocked aid station mid-loop providing the following:

• FOOD: small cups of: M&Ms, gummi bears, pretzels, Pringles, dill pickle slices, fig bars
• Please point to what you would like and a volunteer will take the cup and drop the contents in your hand (health rules may change without notice on this site)
• LIQUIDS: water, Gatorade, flat Coke and ginger ale, pickle juice
• Please consider bringing a collapsible cup and/or water bottle for liquids.

An aid station with water and Gatorade only will be at the beginning of each loop. Plan to bring any other favorite foods in your drop bag.

To register, click UltraSignup link to be added when open.

There is a limit of 350 runners. Register early to make sure you don’t miss the cut-off!