In Iowa, the peak of fawning is the last week in May through the first week in June.
The peak of breeding is about November 8-16. Of course, there are does that breed well before this and well afterwards too so you would see fawns being dropped in IA before and after the peak dates. The "peak" just represents the majority of activity under the bell-shaped curve (a normal curve).
The fetuses I have been looking at in road-killed does (as recently as last Wed.) still have about 4 more weeks to go (on average) before parturition.
I hope everyone has a good week.
Take Care,
Tom