01
LIGHTS OUT
Headlamps on. Breath in the air. You start in full dark, when the temperature is still falling.
FROSTLINE
THE COLD DOESN'T CARE.
A winter endurance challenge that starts in the dark and ends at first light. Run as many loops as you can — and earn the dawn.
JANUARY 2027/DUSK TO DAWN/DES MOINES · STATEN ISLAND · CINCINNATI
RUN UNTIL
DAYLIGHT
No finish line, no clock to beat — just the loop, the cold, and the people beside you. Keep moving through the cold and the dark. When the sun clears the ridge, the grind gives way to hot breakfast, an award ceremony, and a shared celebration with everyone who endured.
02
LOOP AFTER LOOP
Run, walk, or grind it out. Every loop counts. Go as far as you can — your pace, your limit.
03
EARN THE DAWN
First light is the finish. Hot breakfast, an award ceremony, and a sunrise you'll remember because you earned it.
THREE NIGHTS.
THREE CITIES.
Pick your city and claim a waitlist spot. Venues are announced to the waitlist first. Somewhere else? Request your city.
DES MOINESJAN 9
Riverview ParkJoin waitlist →
STATEN ISLANDJAN 16
Wolfe's Pond ParkJoin waitlist →
CINCINNATIJAN 23
Eden Park · Mirror LakeJoin waitlist →
NOT IN YOUR CITY YET?
BRING FROSTLINE TO YOUR CITY
Tell us where you run. We'll let you know the moment Frostline is live near you, and enough sign-ups from one city help us decide where to go next.
REQUEST LOGGED
We'll email when Frostline comes to .
THE COLD IS THE COURSE.
Frostline is built for the hours most people sleep through. It's hard on purpose — and it's better together.