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The UVM Apple Program:

Extension and Research for the commercial tree fruit grower in Vermont and beyond...

UVM Apple Orchard: Horticulture

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Critical Temperatures (F) for Tree Fruit Bud Stages1(WSU)

 Bud Stage

Silver Tip

Green Tip

Half-inch Green

Tight Cluster

First Pink

Full Pink

 First Bloom

Full Bloom

Post Bloom

 Ave. temp. for 10% kill2

 15

18

23

27

28

28

28

28

28

 Ave. temp. for 90% kill2

2

10

15

21

24

25

25

25

25

                  1For Red Delicious, Golden Delicious and Winesap approximately one degree hardier;  Rome Beauty, two degrees hardier;

                                                except after petal fall when all varieties are equally tender                   

                            2 Avg temperatures found by research at the WSU Res. and Ext. Center, Prosser,  to result in 10% and 90% kill


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