The bees we're talking about here are honey bees (a.k.a. Apis mellifera). Honey bees are by far the most important crop pollinator here and in many parts of the world. They are not native to North America, but over the last 400+ years, we have come to rely on them heavily for pollination of many fruit, nut, and vegetable crops grown across the U.S.
Annually, millions of bees are sent on an artificial migration route (artificial because humans put them on trucks and move them wherever they are needed) to pollinate crops such as almonds (in California), apples and cherries (in the Pacific Northwest, and in the Great Lakes region), blueberries (in the southeast, in Michigan, and in Maine), and vegetables (in California, Florida and all up the mid-Atlantic states and the Great Lakes region).
Michigan growers of cherries, apples, blueberries and other early spring-blooming crops, rely on thousands of hives being trucked up from Florida or over from California after they have finished pollinating crops there. This recent article published on the MSU Extension News website outlines the problems that an early spring can cause for growers relying on honey bees.
All of this activity is nearly 3 weeks ahead of the average. I suspect that if we do have a frost, as most of the fruit growers are expecting with some resignation, the native bees will survive the freeze, but may have trouble finding food for however long it takes for new flowers to open on plants that were not damaged by the freeze.
At least we aren't having a problem with there not being enough native bees due to the weather. They are here and are already getting busy. Here's hoping they continue to find enough food if it does freeze out there!