Starting April 7, 2026, I-25 express lanes in northern Colorado will charge variable tolls based on traffic and time of day.

Starting April 2026, drivers on a 14-mile stretch of I-25 in Northern Colorado, from mile markers 250 to 269, will face variable tolls for using the express lanes, which are currently free during a testing phase. Tolls will adjust based on traffic and time of day, displayed on overhead signs, with lower rates for transponder users and free access for vehicles with three or more occupants using an HOV transponder. While the Colorado Department of Transportation has not set an official start date, a reliable source predicts tolls will begin on April 7, 2026. The system aims to reduce congestion during peak times and improve traffic flow.