Blueberry Freeze Damage: Bud-Stage Temperature Thresholds

Damage depends on bud development stage and minimum temperature. Key thresholds (90% kill):

• Swollen flower buds: 21 °F
• Individual flowers distinguishable: 25 °F
• Corollas expanded but closed: 28 °F
• Fully open flowers: 31 °F
• Post-bloom (tiny fruit): 28 °F

Rabbiteye types tolerate colder temps at early stages. Monitor forecasts; if a hard freeze threatens at vulnerable stages, consider row covers or overhead irrigation for frost protection.