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Critical Bud Temperatures

With the cold temperatures occurring in the area its good to know the critical temperatures at different bud stages listed below. From http://www.tfrec.wsu.edu/pages/cpg/Critical_Temperatures

Critical Temperatures / Bud Death Table
(from WSU Extension)
Bud Stage
1 2 3 4 5 6 7
degrees Fahrenheit
 Apple
silver tip green tip 1/2 inch green tight cluster first pink full pink first bloom
10% kill 15 18 23 27 28 28 28
90% kill 2 10 15 21 24 25 25
Pear
buds opening buds exposed tight cluster first white full white first bloom full bloom
10% kill 15 20 24 25 26 27 28
90% kill 0 6 15 19 22 23 24
 Peach
first swelling calyx green calyx red first pink first bloom full bloom postbloom
10% kill 18 21 23 25 26 27 28
90% kill 1 5 9 15 21 24 25
Apricot
first swelling tip separates calyx red first white first bloom full bloom in the shuck
10% kill 15 20 22 24 25 27 27
90% kill 0 9 14 19 22 24
Plum (Prune)
first swelling side white tip green tight cluster first white first bloom full bloom
10% kill 17 20 24 25 26 27 28
90% kill 3 7 16 20 22 23 23
Cherry
first swelling side green tip green tight cluster open cluster first white first bloom
10% kill 17 22 25 26 27 27 28
90% kill 5 9 14 17 21 24 25

Additional information

 

New cherry bud hardiness information from OSU
http://extension.oregonstate.edu/wasco/sites/default/files/cold_frost_and_dead_buds.pdf

Blog from OSU David Gibeaut http://blogs.oregonstate.edu/gdavs/

Critical Temperatures at Bud Stages Charts

Washington State University