Hello, Hugh: 

Thank you for your question, which has been routed to the CSU Master Gardener Help Desk. Successfully growing fruit trees in this climate is an enjoyable challenge. 

Yes, "Haralson" and "Honeycrisp" are compatible from a pollination perspective. First, the obvious: do the trees appear healthy with no visible illnesses, consistent flowering every year, and healthy new growth? How much are you fertilizing the trees? Are they planted in full sun? Are you pruning the trees too heavily? Are the cross-pollinating trees within 100 feet of each other for adequate pollination? Are you using insecticides like carbaryl? Are the flowers getting frost damage/kill at 7,600 feet elevation? How old are the trees? Sometimes, it just takes a few years for apple trees to start bearing. Depending on your rootstock, it's unlikely you will see much fruit until 3-5 years after planting apple trees. "Honeycrisp" in particular can take up to 7 years to start bearing and is prone to biennial bearing. I suspect that your trees are probably just a bit young to be bearing, but it is possible that this is a pollinator/honey bee issue as you mention. Given that both "Haralson" and "Honeycrisp" are mid/late season apples, I doubt this is the main problem . . . particularly if you have neighbors who are successfully harvesting apples.

Thank you for your question, and we look forward to getting more information about the situation. If you wish to contact the Help Desk directly, please feel free to stop by our office at 17 N. Spruce Street, Colorado Springs, from 9-12 and 1-4 p. m. on Mondays and Wednesdays or email us at <personal data hidden>. 

Happy gardening,

Heidi V.

Volunteer Master Gardener