About Colorado 811
Colorado 811 serves all of Colorado, covering a diverse mix of Front Range urban areas, mountain communities, agricultural Eastern Plains, and resort towns with unique utility infrastructure challenges.
Submit tickets at https://www.colorado811.org or dial 811 from any phone.
Required Wait Period in Colorado
Colorado requires 3 business days notice before excavation. Colorado 811 offers online ticket submission through their portal at colorado811.org.
Use the Wait Time Calculator to find your exact dig date accounting for weekends and holidays.
Ticket Validity and Re-Notify in Colorado
Colorado's 20-day validity window is moderate. For projects running longer than 17 days, plan re-notification in advance. Colorado 811's online system makes this straightforward.
Private Lines in Colorado
Colorado has significant rural propane infrastructure, private well water throughout rural areas, and in mountain resort communities, a range of private utility installations that 811 won't cover. Always assess private lines before any Colorado excavation.
See the full guide: What 811 Does NOT Cover.
How to Submit a Ticket in Colorado
Pre-mark excavation area in white
Mark each planned dig location with white paint or stakes before submitting.
Submit online or call 811
Visit https://www.colorado811.org or dial 811. Include address, work type, start date, and depth.
Wait 3 full business days
Do not dig until the wait period has elapsed AND all utilities have responded.
Verify all responses
Log in with your confirmation number. Every utility must show "marked" or "clear."
Calculate Your Colorado Dig Date
Get your exact legal dig date, expiration date, and re-notify reminder instantly.
Open CalculatorRelated Guides
How 811 Works
Complete process guide.
Color Codes
What the marks in your yard mean.
Re-Notify Rules
When your ticket expires mid-project.