A Race too Big for this Little Girl?

In order to keep myself motivated to keep training and training well I find that signing up for road races every so often throughout the summer and into fall really benefits me.  Well I might have bitten off more then I can chew with this one... a week or so ago I looked for half marathons in the July - August time frame.  I've reached 10 miles on my weekly long runs so I figured it's about time to get some races in here.  And one of the only CO half marathon's that I'll be available for is the Keystone Half Marathon.
the race starts at an elevation of just over 9,300 feet above sea level! Should be a fun race, see if I handle these Rocky Mountains :)