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Which cohort am I in?

There are two cohorts. You'll be placed in one when you sign up. The One Car Challenge runs in two cohorts. When you enroll, you'll be placed in whichever cohort still has spots open. We can't move you between cohorts after sign-up.

Written by Magda Waskiel

Cohort dates

Cohort

Starts

Ends

Cohort 1

Monday 17 August 2026

Sunday 27 September 2026

Cohort 2

Monday 12 October 2026

Sunday 22 November 2026

Each cohort is the same length — five active weeks of reporting, with a short baseline week at the start.


What if I want a specific cohort?

Sign up early. We don't take requests once cohorts fill, but during enrollment you'll see which one you've been placed in before you finish.


What if I can't make my cohort?

Email us before your cohort begins and we can usually withdraw you and let someone else take your spot. See the Withdrawing from the program article for details on partial payouts.

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