Zone 4a Almanac

What growers in zone 4a actually recorded

Every row below comes from real plantings and harvest logs kept by growers in zone 4a. Nothing is published until enough growers have recorded it, so the gaps are real gaps, not guesses.

Last frost: May 20

First frost: September 20

These two frost dates are the conventional zone-wide averages for zone 4a, not a reading from a station near you, so treat them as plus or minus about two weeks until you enter your own. Crop rows below are medians of member records, each published only after enough growers logged it. See the full method, sources, and confidence bands.

Loading zone 4a results…

See how your season compares

Log a planting and its harvests and Harvestead will tell you whether you came in ahead of or behind zone 4a, crop by crop.

Track my garden