10/21/2026
In Colorado, the 30-day breach notification clock does not start when you first notice something odd.
It starts at "determination," the point where there is sufficient evidence to conclude a breach actually took place. Before that, the law expects a prompt, good-faith investigation. After it, you have no more than 30 days to notify affected Colorado residents.
Two details worth knowing:
A leaked username or email plus a password can count as personal information on its own. No Social Security number needed.
If a breach is reasonably believed to have affected 500 or more Colorado residents, the Attorney General has to be told inside that same 30 days. If more than 1,000 residents must be notified, the nationwide credit bureaus are notified too. Knowing where the clock starts is the part worth settling before an incident, not during one.
We put the Colorado rules together with the statute and Attorney General sources linked, if you want to read further: https://mynewitguys.com/colorado-data-breach-notification-law/