Midwinter temperatures of
0°F may kill some fruit buds on peaches. Many buds may be damaged
if the temperature drops below -10°F. However what is most important
is the temperature which occured within several days before the drop.
If temperatures were already cold up to the low temperature drop, much
less bud injury and death will occur. Buds and flowers will survive slightly
lower temperatures if the drop is very slow, and if the minimum temperature
occurrs for only a short period. As the buds swell and develop in early
spring they become less cold hardy and prone to injury. Unopened peach
buds showing pink color will survive temperatures of 20 to 23°F.
At full bloom, damage can occur at 29°F. Ten days after bloom the
young developing fruit will withstand only 28°F.
© Erv Evans, Consumer