I've tracked this in the past and it starts with a lot and trails of over a week, then has a giant jump at the end. People like you and me who follow politics year round probably already have our votes in. People who don't really follow politics (like the rest of my family) haven't even started thinking of it yet. As close as the three main races are (I think McInnis/Maes is very close because of the McInnis plagiarism incident), every one of the remaining votes is going to matter.
So first we have votes received by the Boulder County Clerk. Keep in mind they show a running total, not the number in each day.
And here is the stats of people visiting my www.coloradoballot.net site. These are 99% people coming to the site via Google searches so it's a decent measure of people looking for information on the candidates.
So ballots arrived Monday last week but people started voting Wednesday and a lot did so through Sunday. Then it started its decline. We'll see this slower rate up until about August 6 is my guess. But still a good number each day, which adds up.