Demo: Hammonton blueberries. 7-day low-temp forecast against dormant damage / kill thresholds.
| Stage | Damage below | Kill below |
|---|---|---|
| Dormantcurrent | 10°F | 0°F |
| Bud swell | 23°F | 18°F |
| Tight cluster | 27°F | 22°F |
| Pink bud | 28°F | 25°F |
| Full bloom | 30°F | 28°F |
| Petal fall | 31°F | 28°F |
| Fruit set | 32°F | 30°F |
Source: Washington State Univ. Tree Fruit Research Ext. frost tables adapted to NJ-relevant varieties. Thresholds are 30-minute exposure at that temperature. Wind machines, orchard heaters, and overhead irrigation can offset by 2–4°F.
We'll email you the afternoon of any night where forecast low falls under your crop's stage-specific damage or kill threshold — with enough lead time to move wind machines, fire up heaters, or harvest ready fruit.
Frost nights narrow your spray opportunity. Check when conditions align next.
See spray window