They emerge in June (here in Utah) and have 2+ generations before first frost dates. They pollinate many many times better than honeybees. They need consistent 70 degree weather to finish incubation. You need about 100 bees per 20x20 area of garden. They usually double or triple in numbers every year. 100 bees $30
My favorite is the 104 hole leaf cutter laminate which has a painted black front and has been seasoned for one year and is an incredible attractant. This already has +/-100 bees that have been completely inspected so you're not starting with anything but the best. If you have a habitat you just need 100 Loose and inspected cocoons of bees to get you started.
For this listing of just the Loose bees, I have a special shipping option you can use to cover your shipping if you're buying just these. Adding candles etc shipping goes up but these are a small film canister size I can ship easily.
use code POLLINATE for your order of just leafcutter loose bees for free shipping at checkout.