Colorado's toll plates let you drive express lanes without stopping to pay, but the state bills you monthly for the distance you travel

Colorado's toll system uses Express Toll Lanes on I-25 and I-270 near Denver. When you drive in these lanes, cameras read your license plate and the state sends you a bill each month based on how many miles you drove. You do not stop at a booth or pay upfront—the charge appears on your vehicle registration statement or a separate toll invoice.

The toll amount changes based on traffic. During rush hour, tolls are higher (sometimes $1 to $3 per trip). During off-peak times, they cost less. The state sets prices to keep traffic moving at 50 mph or faster. If you drive the same route every weekday, your monthly bill can range from $50 to $150 or more, depending on the time of day and current demand.

You do not need a special transponder or sticker. The system reads your standard Colorado license plate automatically. Out-of-state drivers are also billed this way—the state tracks the vehicle and mails an invoice to the address on the registration.

Key Takeaways

  • Colorado's Express Toll Lanes on I-25 and I-270 charge based on your license plate, with no transponder required.
  • Tolls vary by time of day and traffic volume, ranging from under $1 during light traffic to $3 or more during peak hours.
  • Monthly bills are sent to the vehicle owner's address on file with the Colorado Department of Motor Vehicles.
  • If you do not pay a toll bill, the state can place a hold on your vehicle registration renewal and refer the debt to collections.

How the toll amount is set each day

The Colorado Department of Transportation (CDOT) uses a dynamic pricing system. Tolls start low in the morning and increase as traffic builds. The goal is to keep the express lane moving at a minimum speed—if traffic slows below that threshold, the toll goes up to discourage drivers from entering, which clears congestion.

Prices are posted on electronic signs before you enter the express lane. You can see the current toll and decide whether to pay or stay in the regular lanes. The toll is charged only if you drive in the express lane; using the regular lanes is free.

CDOT publishes historical toll data on its website, so you can see what tolls typically cost on your route at different times. This helps you decide whether to use the express lane on a given day or plan your commute to avoid peak pricing.

What happens if you do not pay a toll bill

If you ignore a toll invoice, the state will send you a notice. After 30 days without payment, CDOT refers the debt to a collection agency. The unpaid toll amount grows because collection fees are added.

More importantly, CDOT can place a registration hold on your vehicle. When your registration expires, you will not be able to renew it until you pay the toll debt. This means you cannot legally drive the vehicle in Colorado. The hold stays in place even if you move out of state, because it is tied to your vehicle's title.

If the debt is large enough or remains unpaid long enough, it can be reported to credit bureaus and affect your credit score. The best approach is to pay the bill when you receive it or contact CDOT to set up a payment plan if you cannot pay in full.

How to check your toll account and pay bills

You can view your toll charges through the CDOT Express Toll Lanes website (expresstollanes.com). You will need your license plate number and the last four digits of your vehicle identification number (VIN) to log in. The site shows your current balance, past invoices, and payment history.

Payments can be made online through the same website, by phone, or by mail. Online payment is the fastest—it usually posts within one business day. If you set up automatic payments, your account will be charged each month without you having to remember to pay.

If you believe a charge is wrong—for example, if your plate was misread or you did not actually drive in the express lane—you can dispute it through the website or by calling CDOT. You will need to provide details about the trip date and time. CDOT reviews disputes and refunds charges if they find an error.

Toll discounts and payment plans

Colorado does not offer discounts based on income or vehicle type. However, if you use the express lane frequently, you may save money compared to paying tolls on other roads. Some employers and transit agencies offer commuter benefits that can be used toward toll payments, so check with your workplace.

If you cannot pay your bill in full, you can contact CDOT to request a payment plan. The state will work with you to set up monthly installments rather than referring your account to collections when ready. This keeps your registration from being held and gives you time to catch up.

Some drivers choose to avoid the express lane entirely and use the regular I-25 and I-270 lanes, which are free. This adds time to your commute but eliminates the toll cost. The choice depends on whether the time savings is worth the expense for your situation.

Out-of-state drivers and toll bills

If you live outside Colorado and drive through the Express Toll Lanes, you will receive a bill by mail at the address registered with your home state's DMV. The invoice includes the toll amount, the date and time of your trip, and instructions for payment.

Out-of-state drivers have the same payment options as Colorado residents: online, by phone, or by mail. If you do not pay, CDOT can refer the debt to a collection agency, and it may appear on your credit report. However, CDOT cannot place a registration hold on an out-of-state vehicle, so the enforcement is limited to collections.

If you drive through Colorado regularly, you may want to set up an online account and check your balance periodically to avoid surprise bills. Some travelers choose to avoid the express lanes and use the regular lanes instead, even if it takes longer.

Frequently Asked Questions

Can I get a refund if I drove in the express lane by mistake?

Yes, you can dispute the charge through the CDOT website or by phone. Explain that you entered the express lane unintentionally and provide the trip date and time. CDOT reviews disputes and refunds charges if the error is confirmed. You typically have 30 days from the invoice date to dispute.

What if my license plate was misread?

Contact CDOT with the trip date, time, and your plate number. If the system charged a similar plate by mistake, CDOT can investigate and correct the error. Provide any evidence you have, such as a photo or witness statement, to support your claim.

Do I have to use the express lane if I drive on I-25 or I-270?

No. The express lanes are separate from the regular lanes. You can stay in the free regular lanes and avoid tolls entirely. The express lanes are optional and designed for drivers who want faster travel and are willing to pay for it.

Will unpaid tolls affect my credit score?

If CDOT refers your debt to a collection agency and it remains unpaid, it can be reported to credit bureaus and lower your score. Paying the bill or setting up a payment plan before collections involvement protects your credit.

Can I see what tolls cost before I drive?

Yes. Electronic signs posted before the express lane entrance show the current toll price. You can also check historical pricing on the CDOT website to see what tolls typically cost at different times of day on your route.