Fact sheet 7.002, "Pollination of Tree Fruits," has a nice table which shows the compatibility of different apple cultivars for pollination. There is additional information on fruit growing in Colorado on: Plantalk-Fruit, and here is the link for: Pollination of Tree Fruits.
On this page, there is information on "Fruit Bloom Dates." Because this information comes from Grand Junction, it may not be 100 percent accurate for the Front Range. However, the cultivars that bloom at the same time in Grand Junction, are likely to bloom at the same time on the Front Range.
