When Does Open Enrollment Start 2024. For aca marketplace plans, open enrollment is running from nov. Open enrollment starts — first day you can enroll in, renew, or change marketplace plans.

For most states, open enrollment for 2025 coverage runs from november 1, 2024, to january 15, 2025. However, individuals must enroll by december 15 in most states if they want their insurance coverage to start on january 1.