I had a very successful vegetable garden this summer. I live at 8,550 feet and we had a mild frost the third week in August. The garden survived several torrential rainstorms and hail. I had flea beetles in June munching on the arugula and other salad greens but that was it for any bug problem. I have six raised beds lined with hard cloth to protect from the voles. I plant the garden memorial day weekend and use seeds except I buy broccoli starts. My garden is in full sun but the location is in a valley and close to a wetland. Thus my temperatures are cooler and I have found I cannot grow potatoes or green beans. The season is too short. I certainly enjoy all the salad greens which are romaine, bibb, black seeded simpson and arugula. I plant tyee spinach, kale, bright lights chard, shallots, carrots, peas, radishes and beets. I do succession planting with romaine, carrots, radishes and chard. Our friends are helping us enjoy this abundant garden bounty and it's makes me very happy to be able to have had such luck this summer.
An excellent CSU fact sheet, Colorado Mountain Gardening Basics http://www.ext.colostate.edu/pubs/garden/07244.html