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Colorado 811 rules

In Colorado you call Colorado 811: 2 business days, not including day of notice. Ticket life: marks valid while clearly visible but not more than 30 calendar days after locate due date; notify 2 business days before 30-day end to continue.

Advance notice before digging
2 business days, not including day of notice.
Farthest ahead you can call
Not confirmed in the law we read. Ask Colorado 811.
How long the ticket or marks last
Marks valid while clearly visible but not more than 30 calendar days after locate due date; notify 2 business days before 30-day end to continue.
Tolerance zone (hand dig inside it)
18 inches horizontally from exterior sides of facility (nondestructive means).
White lining (premarking)
Not confirmed in the law we read. Ask Colorado 811.
The law
C.R.S. 9-1.5-101 et seq. (9-1.5-103).

Call 811 from anywhere in Colorado to reach Colorado 811, or file online at colorado811.org.

Running several digs at once?

TrackOver keeps each ticket number, markout date and expiry on the job it belongs to, and warns before a ticket runs out, so the crew in the hole isn't digging on a dead ticket.

Start free811 ticket trackingDig GuardFind dig work on the board

Where this comes from

Checked September 24, 2026 against the one-call center's published copy of the law, because the legislature's own site couldn't be read directly. Rules change; confirm with the center before a big job.

Using TrackOver in Colorado? See excavation contractor software in Colorado.

Working as a sub in Colorado? How fast a GC has to pay you in Colorado.

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