Yes, you can reach 50 miles (and hundreds of smiles) in August, easily. You will progress much faster than you think.
I started in about March, 11 years ago. By the middle of June that year I rode 350 miles of Colorado passes in a 7 day tour. One of those days was 90 miles over 2 passes.
One thing I have noticed is that many folks who don't ride for smiles, at least some of the time, don't last too long.
Mostly, have fun.