My first 2 swarms caught in traps last year was April 20th and 21st.
Depending on what you have for your flow. Mine seems to start about April 10th - May with Clover, Vetch, Horse Mint, Indian Blanket, and other wildflowers at different times. Then I get the mesquite flow in June. It last about a month.
I'm seeing redbud, Bartlett pear, henbit, davodils, and a bunch of other stuff blooming. I must have missed the maples. It can't be long, but I honestly haven't found time to do more than drive by a few of mine.
Up in Amarillo I usually start getting swarm calls around April 15-20. Peaches and pears typically begin blooming around March 25 and Apples about three weeks later. Not sure about the mesquite but I'll be watching this year. Good luck.
I have seen swarms in early March in some years, before any of the trees leaf out. Our main honey flow is mid May to mid June; it is usually indian blanket and horsemint. If you watch craigslist in the spring you see when the swarms are starting in Dallas. Typically our first swarms are a little later than Dallas.
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