Seems this comes up nearly every year. While I would never pretend to have the knowledge our own Prairie Drifter, I try very hard to study the habits, traits, and needs of the game we love. What's attached may seem a bit extreme, but it's the type of data I collect to help me learn more about upland game.
The chart below is from 2010. While the curve is somewhat average for quail, it is not truly normally distributed (for 2010). If you were to take the data for each year and overlay it on this type of chart, you would find the hatch curve to be normally distributed with the peak of the hatch (in Kansas) roughly on Father's day.
Source KDWP - 2011
A few of things to note:
1) Although rare, a few quail hatched as early as May 7 - 13
2) Incubation period is roughly 23 days. This means that nesting occurs not only before the hatch, but significantly before the hatch. Let's say a hen lays an average of 13 eggs at a rate of 1 per day; this means that nesting must occur a minimum of 36 days before the hatch (13 + 26). In all likelihood, nesting begins earlier than 36 days before the hatch (at least at this time of year).
3) The period of June 25 - July 1 in the chart above is an anomaly. Something happened during that period (or well before) that slowed/hampered nesting. This may be explained by a significant or widespread weather event which forced renesting, the need for the hen to start over, or delayed the nesting cycle for a large portion of the survey area.
Well, I guess that settles it, I'm a complete dork!!
Prairie Drifter, care to weigh in and let us know how it really works?
Point!