Each year in February a main lottery is held to assign launch dates for river trips occurring the next year. Lottery applications are accepted online for the first three weeks of February. Lottery results are emailed to applicants as well as available online by the end of February.
Follow-up lotteries are then held as needed to reassign cancelled and/or left-over river trips. Follow-up lotteries typically open around noon on a Tuesday and close at noon Mountain Standard Time on a Thursday. Lottery results are emailed to applicants as well as available online, usually by Thursday evening.