Critical Spring Temperatures for Tree Fruit Bud Development Stages
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Pome Fruit |
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Apples |
Silver tip |
Green Tip |
½ inch green |
Tight Cluster |
First Pink |
Full Pink |
First Bloom |
Full Bloom |
Post Bloom |
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Old temp |
16 |
16 |
22 |
27 |
27 |
28 |
28 |
29 |
29 |
||||
10% kill |
15 |
18 |
23 |
27 |
28 |
28 |
28 |
28 |
28 |
||||
90% kill |
2 |
10 |
15 |
21 |
24 |
25 |
25 |
25 |
25 |
||||
Pears |
Bud Swell |
Bud Burst |
|
Tight cluster |
First White |
Full White |
First Bloom |
Full Bloom |
Post Bloom |
||||
Old temp |
18 |
23 |
|
24 |
28 |
29 |
29 |
29 |
30 |
||||
10% kill |
15 |
20 |
24 |
25 |
26 |
27 |
28 |
28 |
|||||
90% kill |
0 |
6 |
15 |
19 |
22 |
23 |
24 |
24 |
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Stone Fruit |
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Apricots |
Bud Swell |
Bud Burst |
Red Tip |
First White |
First Bloom |
Full Bloom |
In the Shuck |
Green Fruit |
|||||
Old temp |
-- |
23 |
-- |
25 |
-- |
28 |
-- |
31 |
|||||
10% kill |
15 |
20 |
22 |
24 |
25 |
27 |
27 |
28 |
|||||
90% kill |
-- |
0 |
9 |
14 |
19 |
22 |
24 |
25 |
|||||
Peaches |
Bud Swell |
Calyx Green |
Calyx Red |
First Pink |
First Bloom |
Full Bloom |
Post Bloom |
|
|||||
Old temp |
23 |
-- |
-- |
25 |
-- |
27 |
30 |
|
|||||
10% kill |
18 |
21 |
23 |
25 |
26 |
27 |
28 |
||||||
90% kill |
1 |
5 |
9 |
15 |
21 |
24 |
25 |
||||||
European Plums |
Bud Swell |
Side White |
Tip Green |
Tight Cluster |
First White |
First Bloom |
Full Bloom |
Post Bloom |
|||||
Old temp |
-- |
-- |
-- |
-- |
23 |
27 |
27 |
30 |
|||||
10% kill |
14 |
17 |
20 |
24 |
26 |
27 |
28 |
28 |
|||||
90% kill |
0 |
3 |
7 |
16 |
22 |
23 |
23 |
23 |
|||||
Sweet Cherries |
Bud Swell |
Side Green |
Green Tip |
Tight Cluster |
Open Cluster |
First White |
First Bloom |
Full Bloom |
Post Bloom |
||||
Old temp |
23 |
23 |
25 |
28 |
28 |
29 |
29 |
29 |
30 |
||||
10% kill |
17 |
22 |
25 |
26 |
27 |
27 |
28 |
28 |
28 |
||||
90% kill |
5 |
9 |
14 |
17 |
21 |
24 |
25 |
25 |
25 |
||||
Tart Cherries |
Bud Swell |
Side Green |
Green Tip |
Tight Cluster |
Open Cluster |
First White |
First Bloom |
Full Bloom |
|
||||
10% kill |
15 |
24 |
26 |
26 |
28 |
28 |
28 |
28 |
|
||||
90% kill |
0 |
10 |
22 |
24 |
24 |
24 |
24 |
24 |
Old standard temperature represented the critical temperature in Fahrenheit (the lowest temperature that can be endured for 30 minutes without damage). In addition, the chart shows the temperature at which 10% and 90% of normal buds will be killed. These numbers were taken from Washington (WSU), and Michigan State Unversity (MSU) Extension Bulletins. Apple - WSU EB0913, Pears - WSU EB0978, Sweet Cherries - WSU EB1128, Peaches - WSU EB0914, Apricots - WSU EB1240, Tart Cherries - MSU Research. Rpt. 220.
See Picture Table of Critical Spring Temperatures for Tree Fruit Bud Development Stages