The 2026 SIX03 Endurance Membership is now open!

2026 is the year of the Fire Horse:

The Horse embodies enthusiasm, speed and fieriness, bringing a year of focused bold moves and exploration. This sounds like our type of year!

Welcome to the SIX03 Endurance Team!!!

Click the button to join. Below is a bunch of race info so you don't miss out on any fun in 2026.

Mountain Racing comes back to Sunapee!

June 1st 2026

$30,000 Prize Purse presented by Brooks Running!

The Sunapee Scramble will serve as the 2026 USATF National Classic Mountain Championship. The race will serve as the sole selection race for the 2026 US Classic Up/Down Mountain Running Team.

The course will start at the base of the mountain, and then follow a service road up to the summit of the mountain. You will then have a speedy descent down Mount Sunapee back to the Base Lodge. For the 2nd lap, the course will use the same service road up the mountain and then it will join into the super technical Newbury Trail all the way to the summit. You will then have another speedy descent down Mount Sunapee back to the Base Lodge.

The race is approx 9.2 miles with 3,250 feet of Vert.

$20,000 Prize Purse Presented by Darn Tough Socks

July 12th 2026

Over the years the Loon Mountain Race has developed quite a following. The reputation as one of the country’s toughest mountain races is due in large part to the kilometer ascent of North Peak via the black diamond trail known as Upper Walking Boss. ‘The Boss’, as it’s affectionately known, is roughly a kilometer of grassy slope with angles that exceed a dizzying 40% grade!

$30,000 Prize Purse presented by Altra Running Shoes!!!

10 year Anniversary of the The Ragged 75 Stage Race!

July 31st, Aug 1st and Aug 2nd

This race is a challenging 75-mile race with approximately 15,500 feet of elevation gain that includes very technical single-track, steep climbs & descents, double track, fire roads, dirt/gravel roads & pavement. We have also added a 50k on Sunday to make the race accessible to folks who can not get away for 3 days.

The race predominantly follows a 75-mile loop of hiking trails, surrounding Lake Sunapee in Western/Central, NH called the SRKG Greenway (Sunapee Ragged Kearsage Greenway).

For the 3 day stage race, Competitors will complete a point-to-point trail of approximately 25 miles in Stage 1 (summiting Mt. Ragged & Mt. Kearsarge), 22 miles in Stage 2 (summiting Mt. Sunapee) and 33 miles in Stage 3.

For the 50k, Competitors will complete a point-to-point trail of approximately 33 miles and 6,300 ft of vertical gain.