I forgot to record the honey flows in NY this past year. What are the approximate dates? I have locust and apple in my area that bloom first.
In Finland willows are the first. They are over 10 common species which bloom during one month.
Cherries and plums are before apple. Gooseberry is good.
At the same time with apples dandelions are everywhere, millions. http://www.agry.purdue.edu/turf/tips/2002/Dandelion%20field.JPG
Mapples are good at spring.
Dates can vary here 3 weeks before and 2 weeks after, total about one month. Root plants are dependent on soil temperature but trees and bushes are dependent on warm weather fronts.
When I lived in small house garden area I got very good yield at early summer, but almost nothing in the middle of summer. I start to carry hives to forrest.
Just next summer look what kind of pollen they bring to hive and learn to see, where it comes from. Quite difficult to learn from theory, what kind of pastures you have there.
There are a lot of garden frowers and bushes where bees visit not at all.