The fall is a long time away, but if you're considering a shorter trail race in October, be sure to check out the Wildcat Mountain Trail Run in Highlands Ranch.
They will offer three distances (5, 10, and 20 miles). The 20 mile option is new this year. The course is fun and fast. I ran the 10 mile course at a 7:00 pace last year, and I never run that fast on trails!
Last year they gave away nice hooded sweatshirts & running hats. They also raffled off tons of running gear. The free pizza and beer was perfect...even at 9:45am.
I plan to be there and you should too. Check out the video from 2010 (my 2 second appearance comes at the minute mark) and then throw the date (10/8) up on your calendar.