List of Northern American nectar sources for honey bees

The nectar resource in a given area depends on the kinds of flowering plants present and their blooming periods.

Hopkins' bioclimatic law states that in North America east of the Rockies, a 130-m (400-foot) increase in elevation, a 4° change in latitude North (444.48 km), or a 10° change in longitude East (two-thirds of a time zone) will cause a biological event to occur four days later in the spring or four days earlier in the fall.

[1] In botany, the term phenology refers to the timing of flower emergence, sequence of bloom, fruiting, and leaf drop in autumn.

An agricultural crop such as canola or alfalfa may be a major or minor source depending on local plantings.

The nectar sources from large cultivated fields of blooming apples, cherries, canola, melons, sunflowers, clover, etc.