Critical Spring Temperatures for Blueberry Cultivation

Learn how low spring temperatures can affect blueberry development, and review the critical temperature thresholds that may cause damage at various bud stages. Blueberries are a popular fruit crop in temperate regions, yet spring frosts can pose a serious threat to yields. During specific stages of development—from swollen buds through full bloom and early fruit formation—short exposures to cold can cause either 10% or even up to 90% bud or bloom damage. Understanding these thresholds helps growers take timely action to protect their crops.

Below is an approximate chart of critical temperatures for blueberries at different developmental phases (based on data and guidance from MSU Extension). Actual values may vary depending on the variety and local climate conditions, so it’s crucial to monitor your regional weather patterns and the specific characteristics of your fields.

Bud Stage	Approx. Temperature for ~10% Kill	Approx. Temperature for ~90% Kill
Swollen Bud	around 20–23°F	around 15°F
Pink Bud	around 25–26°F	around 19–21°F
Full Bloom	around 28°F	around 24–25°F
Petal Fall	around 30°F	around 26–28°F

Note that these figures are guidelines and can vary depending on specific blueberry cultivars and regional differences.

To minimize potential damage in spring, growers often employ various strategies: using row covers or plastic sheeting, employing irrigation systems for “ice” protection, and installing heating devices such as wind machines or heaters in greenhouses. The best approach depends on the size of the operation, the grower’s budget, and the local climate.

Successful blueberry cultivation largely hinges on vigilant temperature monitoring and proactive mitigation measures, enabling you to reduce losses and maintain a high-quality, dependable harvest.

Resource Link: MSU Extension