Colorado tolls work through three main systems, and how you pay depends on which road you're using
Colorado has three separate toll road networks: the Northwest Parkway (near Denver), the E-470 tollway (east of Denver), and the T-Rex corridor on I-25 south of Denver. Each system has its own payment method, and you cannot use one account across all three. If you drive tolled roads in Colorado, you need to know which system you're on and set up payment before you get a bill.
The fastest way to avoid late fees is to set up an account before you drive. If you've already driven and received a bill, you can pay it online when ready — most systems accept credit cards and don't require an account. But if you drive tolls regularly, an account saves you money through discounts and prevents the surprise of a bill arriving weeks later.
Key Takeaways
- Northwest Parkway, E-470, and T-Rex are three separate toll systems in Colorado, each with its own payment account and website.
- You can pay a one-time toll bill online without an account, but setting up an account before you drive saves money through discounts and avoids late fees.
- Northwest Parkway offers a 10% discount for prepaid accounts; E-470 and T-Rex offer discounts for registered vehicles.
- If you receive a toll bill in the mail, you have 30 days to pay before late fees explore, but paying within 10 days avoids a processing fee.
- Out-of-state drivers can set up accounts online using their license plate number and vehicle information.
Northwest Parkway: Account setup and payment options
The Northwest Parkway runs from I-25 north of Denver to I-76 near Boulder. To set up an account, go to nwparkway.org, click "Manage Account," and select "Create New Account." You'll need your vehicle's license plate number, vehicle type, and an email address. The account takes effect when ready, and you can add payment information right away.
Northwest Parkway offers a 10% discount on tolls if you prepay. You can add money to your account in any amount, and it stays there until you use it. If you don't set up an account and drive the parkway, the system photographs your plate and sends you a bill 30 days later. That bill includes a $2.50 processing fee. If you pay within 10 days of receiving the bill, the fee is waived; after 10 days, the fee applies.
You can pay a bill online at nwparkway.org without logging into an account — just enter your plate number and the invoice number from your bill. Credit cards and debit cards are accepted. If you prefer to mail a check, the address is on your bill.
E-470: Discount accounts and toll-by-plate billing
E-470 is the tollway that circles Denver to the east, connecting I-25 south of Denver to I-25 north of Denver via I-76. You can set up an account at e-470.org by clicking "Account Services" and then "Open an Account." You'll need your license plate, vehicle information, and a billing address.
E-470 charges a lower toll rate if you have a registered account — typically 20% to 30% less than the toll-by-plate rate. If you don't have an account, the system reads your plate and bills you at the higher rate. A bill arrives 30 days after you drive, and you have 30 days to pay. Late payments incur a $10 fee per violation.
You can pay an E-470 bill online at e-470.org without an account by entering your plate number and invoice number. The site accepts credit and debit cards. If you set up an account, you can add money in advance or let the system bill you monthly — your choice.
T-Rex corridor: I-25 south of Denver
The T-Rex project added tolled lanes to I-25 between Castle Rock and the Douglas County line. Payment works through the same system as E-470 — you can set up an account at e-470.org or pay a toll-by-plate bill after the fact. The discount for account holders is the same: roughly 20% to 30% off the toll-by-plate rate.
If you drive the T-Rex lanes without an account, a bill arrives 30 days later. You have 30 days to pay. Late fees are $10 per violation. Setting up an account before you drive is the cheapest option if you use these lanes regularly.
What happens if you don't pay a toll bill
If you ignore a toll bill, the system sends a second notice 30 days after the first. If you still don't pay, the toll authority can place a hold on your vehicle registration renewal. In Colorado, you cannot renew your registration if you have unpaid tolls. The hold stays in place until you pay the bill plus any late fees.
If you're disputing a charge — for example, if you believe you were billed twice for one trip — contact the toll authority directly. Northwest Parkway, E-470, and T-Rex each have dispute processes on their websites. You'll need your invoice number and the date you drove.
Setting up an account as an out-of-state driver
You can set up an account with any of Colorado's toll systems using an out-of-state license plate. Go to the toll authority's website, enter your plate number and vehicle information, and provide a billing address. You don't need a Colorado address. If you drive tolls occasionally and don't want to set up an account, you can pay each bill when it arrives — no account is required to pay a bill online.
Some out-of-state drivers prefer to prepay a small amount ($20 to $50) to avoid the surprise of a bill arriving weeks later. This is especially useful if you're visiting Colorado for work or vacation and won't be checking mail closely.
Comparing the three systems at a glance
| Toll System | Location | Account Discount | Late Fee | Website |
|---|---|---|---|---|
| Northwest Parkway | I-25 north of Denver to I-76 | 10% prepaid discount | $2.50 processing fee (waived if paid within 10 days) | nwparkway.org |
| E-470 | Tollway circling Denver to the east | 20–30% account discount | $10 per violation | e-470.org |
| T-Rex | I-25 south of Denver (Castle Rock to Douglas County line) | 20–30% account discount | $10 per violation | e-470.org |
Frequently Asked Questions
Can I use one account for all three Colorado toll systems?
No. Northwest Parkway, E-470, and T-Rex are separate systems with separate accounts. You must set up an account with each toll authority if you drive all three. Your account with one system does not transfer to the others.
What if I get a toll bill but I don't think I drove that road?
Contact the toll authority listed on your bill when ready. Provide your invoice number and the date shown on the bill. The authority can review the photo of your vehicle and help determine whether the charge is correct. If someone else was driving your vehicle, you may be able to dispute the charge or provide their information.
Do I have to set up an account, or can I just pay bills as they arrive?
You can pay bills without an account — just enter your plate number and invoice number on the toll authority's website. However, account holders pay a lower toll rate (10% to 30% less) and avoid the surprise of a bill arriving weeks later. If you drive tolls more than once or twice a year, an account saves money.
Will unpaid tolls stop me from renewing my vehicle registration?
Yes. Colorado places a hold on registration renewal if you have unpaid toll bills. You must pay the bill and any late fees before you can renew. The hold applies to all three toll systems.
Can I pay tolls with a transponder like in other states?
Colorado's toll systems do not use transponders. All three systems use license plate photography and billing. You either set up an account and prepay, or you receive a bill in the mail after you drive.