The toughest 300 miles in Alaska are right here in the Copper River Basin.
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It might be the toughest 300 miles in Alaska,
but the Copper Basin 300 is run
by the nicest dogs and people in mushing.
From the folks who put it all together to the folks who sponsor the race with their money and resources, to the folks who volunteer the week of the race, to those who are out there running with the dogs, we couldn’t ask for a better group of people to go mushing with.
Thank you for making the 2026 CB300 one of our best yet!
The 2027 race will be the 38th running of the CB300
Registration opens in October 2026 - stay tuned!
A dog-sized heartfelt thank you to our sponsors who make the CB300 possible!
Every little bit of help counts. You can still sponsor miles for 2026 and get your name in the hat for the merch raffle! Purchase miles by January 23rd and you’ll be automatically entered.
As a volunteer, non-profit organization, we appreciate all the help we can get to put this race on year after year! Sponsoring a mile is a great way to support us. On January 24th we will raffle off six different special CB300 merchandise packages to six lucky mile sponsors!
Support CB300 by purchasing merchandise.
There are many variations of each product and we are working hard on adding more. By purchasing these items, you support the CB300! Without you and many dedicated volunteers, we could not run this race year after year. Know you are appreciated! Thanks to our generous donors such as locals artists, some of the CB300 merchandise is designed and donated by Karolina Zakravska.
The Copper Basin 300 is a 100% volunteer-based race that starts in Glennallen, AK every year during the second weekend of January.
The CB300 first started in 1990 and was founded with the purpose of supporting local businesses in the slow winter months. 2026 was the 37th running of the race.