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 May 13 – May 17, 2024

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

Week 9: Crop Field Plant Development

% Stage
Date Visited Locations Bud Swell (T1) Early Bud Burst (T2) Bud Burst (T3) Tight Cluster (T4) Early Flower (T5) Percentage of Stems With at Least One Open Flower
13-May Warren 0% 0% 11% 34% 55% 25%
13-May Hope 4% 13% 37% 38% 8% 0%
17-May Orland 0% 0% 40% 30% 30% 85%
13-May Sedgwick 0% 0% 9% 25% 66% 12%
17-May Searsport 0% 0% 3% 14% 83% 47%
14-May Aurora 0% 2% 13% 57% 28% 0%
14-May Jonesboro 2% 14% 32% 41% 12% 0%
14-May Northfield 0% 2% 22% 58% 18% 0%
14-May Whiting 0% 0% 13% 64% 24% 0%
Prune emergence was observed at all locations.

Phenology Site Locations

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

Past Phenology Data: