An 18 Mile Stretch of I-25 in Colorado Started Charging Tolls Today

If you ever use I-25 south of Castle Rock, be prepared to either stay out of the far left lane or start paying to use it! 

The 18 mile express lane in the I-25 “South Gap” between Monument and Castle Rock started charging tolls today (Jan. 17th).

The express lanes first opened in December of 2021. Since then, those tolls were waived for testing.

Express lane drivers will get a bill in the mail for about $1.50 to $3.75, as the rate changes according to the time of day. During periods of heavier traffic, tolls will be more expensive.

CDOT says switchable transponders and toll stickers can save drivers about 40% on the cost of tolls. Drivers using a transponder in the I-25 Gap area can expect to pay between 70 cents and $2 per trip. You can get your transponder here.