SIX03 Endurance

SIX03 Endurance SIX03 is a club of fun, healthy, and athletic people that share a passion for the outdoors and the social community. Just getting into cyclocross? Come meet us!

We are runners, cyclists, swimmers, skiers, snowboarders, cross-fitters, adventure athletes, tri-athletes, social butterflies, and much, much more! Our members range from people looking to run their first 5K, to multi-Ironman finishers. We are recreational runners and we are tri-athletes. We are skiers, riders, and ski lodge drinkers. We are cross-fit curious and World’s Toughest Mudder Finishers. We are always looking for new members and new activities. Training for your first marathon? Deciding what bike to buy for your next tri? Want to know the cheapest place to buy GU? Want to run a 5K? Just want to grab a b**r? We are the newest and most outgoing Endurance club in the Seacoast! That’s right, in case you didn’t get it... SIX03 is here to represent New Hampshire’s Endurance community. Not One Sport, Every Sport!

Kismet Cliff Run is 1 week away!!!Half Marathon & 5 Mile option
09/06/2026

Kismet Cliff Run is 1 week away!!!
Half Marathon & 5 Mile option

September 13, 2026: 1/2 Marathon race in North Conway, NH. Organized by Marathon Sports. Register now on UltraSignup.

Last reminder to sign up for the Ragged 50k!!!! Registration closes on Weds 7/29/26 at Midnight. There is no day of reg...
07/27/2026

Last reminder to sign up for the Ragged 50k!!!!
Registration closes on Weds 7/29/26 at Midnight.
There is no day of registration.
This race is part of a 3 day stage race. We will not be answering your emails when you say you missed the registration cut off because we are on trail. So just signup now, you know you want to.
$30,000 prize purse is on the line, thanks to Altra Running

July 31, 2026: Stage Race race in Danbury, NH. Organized by Marathon Sports. Register now on UltraSignup.

The Loon Mountain Race is 4 days away but Registration closes tomorrow (Thursday ) at Midnight. There is no day of Regi...
07/08/2026

The Loon Mountain Race is 4 days away but Registration closes tomorrow (Thursday ) at Midnight. There is no day of Registration.

July 12, 2026: Loon Mountain Women race in Lincoln, NH. Organized by Marathon Sports. Register now on UltraSignup.

Live Stream for the Sunapee Scramble starts at 8am EST
06/07/2026

Live Stream for the Sunapee Scramble starts at 8am EST

Registration for the Sunapee Scramble closes at Midnight on Thursday June 4th. There is no day of registration. https:/...
06/03/2026

Registration for the Sunapee Scramble closes at Midnight on Thursday June 4th. There is no day of registration.
https://ultrasignup.com/register.aspx?did=133545

USATF-New England Mountain/Ultra/Trail
Northeast Delta Dental
Brooks Running
Maurten
Marathon Sports NH

Register Now!

The Sunapee Scramble is next weekend!
05/29/2026

The Sunapee Scramble is next weekend!

Email from SIX03 Endurance The Sunapee Scramble is a week away!   The Sunapee Scramble is a week away! REGISTER FOR SUNAPEE SCRAMBLE Mountain Racing comes back to Sunapee! June 7th 2026 $30,000 Prize

Trail Race szn has started!!!!DIXON'S REVENGE TRAIL RACE: May 9thhttps://ultrasignup.com/register.aspx?did=135178Sunapee...
05/04/2026

Trail Race szn has started!!!!
DIXON'S REVENGE TRAIL RACE: May 9th
https://ultrasignup.com/register.aspx?did=135178

Sunapee Scramble : June 7th
https://ultrasignup.com/register.aspx?did=133545

Cirque Series Cannon: June 13th
https://www.cirqueseries.com/cannon-mountain

Cirque Series Killington June 27th
https://www.cirqueseries.com/killington

Loon Mountain Race: July 12th
https://ultrasignup.com/register.aspx?did=130991

Ragged 75 Stage Race and 50k July31st, Aug 1st, Aug 2nd
https://ultrasignup.com/register.aspx?did=130238

Kismet Cliff Run Sept 13th
https://ultrasignup.com/register.aspx?did=134149

Cirque Series Jay Peak: Sept 26th
https://www.cirqueseries.com/jay-peak

Vulcan's Fury Trail Race: Oct 11th
https://ultrasignup.com/register.aspx?did=134151

Cranmore Mountain Race: Oct 17th
https://ultrasignup.com/register.aspx?did=134916

Register Now!

Didn't get into the Mount Washington Race because they cut the Participants to 500?Didn't want to spend over $175 to run...
02/26/2026

Didn't get into the Mount Washington Race because they cut the Participants to 500?
Didn't want to spend over $175 to run the Mount Washington Race?
Same day, just a different mountain.

Cirque Series has you covered

The 8.2-mile course kicks off at the base of the K-1 Gondola. With 3,010’ ft of elevation gain, you’ll end up summiting three of Killington Resort’s six peaks. Counter Clockwise course direction, running up from K1 Base Area immediately ascending the service road until you hit Buster Bunny. Yo...

Pretty big announcement for the Kismet Cliff Run!
02/07/2026

Pretty big announcement for the Kismet Cliff Run!

Announcing the welcome return of skyrunning in the USA with a four-race Merrell Skyrunner® USA Series alongside a US stage on the Merrell Skyrunner® World Series – already announced in December. The four races stretch right across America, from the South East to the North West – from New York ...

Address

Washington Street
Dover, NH
03820

Opening Hours

Monday 5am - 8pm
Tuesday 5am - 8pm
Wednesday 5am - 8pm
Thursday 5am - 8pm
Friday 5am - 8pm
Saturday 8am - 12pm
Sunday 8am - 1pm

Telephone

+16038173672

Website

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