Demo: Hammonton blueberries. Running total since October 1, Utah model weighting.
Weights each hour by temperature: peak credit at 36–48°F, reduced credit at marginal temps, and negative credit above 60°F (warm spells reverse dormancy). The Utah model is the NJ/Rutgers standard.
Fruit trees and blueberries need a species/variety-specific amount of chill to break dormancy and bloom uniformly. Insufficient chill causes delayed leaf-out, scattered bloom, and reduced yield — especially in warmer winters.
One-time alert when your variety hits its chill target — the signal to finish pruning and prep your pre-bloom sprays. No ongoing email spam, just the milestone.
Once chill requirement is met, bud swell is coming fast. Plan your pre-bloom fungicide and scout for overwintered pests.
See disease pressure