MISSOULA, Mont. - The race begins at McCormick Park at 6:30. There's a four-mile and a two-mile option.
Both have runners heading out and coming back to the start.
Race organizers say this isn't about anybody winning or losing. It's about raising money to support a worthy cause.
The Runners Edge and Run Wild Missoula each purchased 250 t-shirts. All 500 of those shirts were sold in three hours.
Now runners can donate any amount they see fit.
The folks at Run Wild say most have been donating the recommended $20, even without a shirt to show for it.
"I'm sure we do have some people who, I think the last sizes left were XL and XXL, so I'm sure that people grabbed those. The shirts are too big for them, but they don't care, they want to show their support."
Funds raised will go toward support for the families and victims of the Boston bombings.
Go to onefundboston.org to learn more or make a donation.