Real-Time Wild Blueberry Phenology

About the Wild Blueberry Phenology Tracker

The Wild Blueberry Phenology Tracker allows users to track the growth and development of wild blueberries across different regions as well as assist researchers, farmers, and enthusiasts understand the phenology of wild blueberries, which refers to the seasonal timing of biological events like bud break, flowering, and fruit ripening.


For phenological stage descriptions and photos please visit the:
Maine Wild Blueberry Phenology Guide (PDF)


2024 Wild Blueberry Phenology Record and Weekly Report

Week of July 22 – July 26, 2024

Below is this week’s update on fruit development in crop fields.

Week 19: Crop Field Plant Development

% Stage
Date Visited Locations Petal Fall (Pin Head) Green Fruit Color Change Blue Fruit Over Ripe Fruit
25-Jul Warren 1% 11% 6% 79% 2%
23-Jul Hope 2% 26% 4% 68% 0%
25-Jul Orland 4% 14% 3% 78% 1%
25-Jul Sedgwick 7% 7% 0% 85% 0%
25-Jul Searsport 2% 26% 3% 69% 1%
23-Jul Aurora 4% 23% 2% 69% 1%
23-Jul Jonesboro 3% 16% 2% 78% 1%
23-Jul Northfield 3% 16% 5% 74% 2%
23-Jul Whiting 3% 36% 3% 58% 0%
Prune tip die back was observed at visited locations.

Phenology Site Locations

Blueberries ripening on stem
Visit the Estimating Your Fruit Set page.
Winter kill
Winter Kill

Past Phenology Data: