Critical spring temperatures for tree fruit bud stages

Michigan and Washington State data to help judge the potential for injury.

View the data in the table below or view as a pdf file.

Pome Fruit

Apples Silver
tip
Green
Tip
½ inch
green
Tight
Cluster
First
Pink
Full
Pink
First
Bloom
Full
Bloom
Post
Bloom
Old temp
10% kill
90% kill
16
15
2
16
18
10
22
23
15
27
27
21
27
28
24
28
28
25
28
28
25
29
28
25
29
28
25
Pears Bud
Swell
Bud
Burst
Tight
cluster
First
White
Full
White
First
Bloom
Full
Bloom
Post
Bloom
Old temp
10% kill
90% kill
18
15
0
23
20
6
24
24
15
28
25
19
29
26
22
29
27
23
29
28
24
30
28
24

Stone Fruit

Apricots Bud
Swell
Bud
Burst
Red
Tip
First
White
First
Bloom
Full
Bloom
In the
Shuck
Green
Fruit
Old temp
10% kill
90% kill

15
23
20
0

22
9
25
24
14

25
19
28
27
22

27
24
31
28
25
Peaches Bud
Swell
Calyx
Green
Calyx
Red
First
Pink
First
Bloom
Full
Bloom
Post
Bloom
Old temp
10% kill
90% kill
23
18
1

21
5

23
9
25
25
15

26
21
27
27
24
30
28
25
European
Plums
Bud
Swell
Side
White
Tip
Green
Tight
Cluster
First
White
First
Bloom
Full
Bloom
Post
Bloom
Old temp
10% kill
90% kill

14
0

17
3

20
7

24
16
23
26
22
27
27
23
27
28
23
30
28
23
Sweet
Cherries
Bud
Swell
Side
Green
Green
Tip
Tight
Cluster
Open
Cluster
First
White
First
Bloom
Full
Bloom
Post
Bloom
Old temp
10% kill
90% kill
23
17
5
23
22
9
25
25
14
28
26
17
28
27
21
29
27
24
29
28
25
29
28
25
30
28
25
Tart
Cherries
Bud
Swell
Side
Green
Green
Tip
Tight
Cluster
Open
Cluster
First
White
First
Bloom
Full
Bloom
10% kill
90% kill
15
0
24
10
26
22
26
24
28
24
28
24
28
24
28
24

Old standard temperature is the lowest temperature that can be endured for 30 minutes without damage.
This chart also shows the temperature that will kill 10 % and 90 % of normal fruit buds.
These numbers were taken from Washington (WSU), and Michigan (MSU) Extension Bulletins.
Apple - WSU EB0913,    Pears - WSU EB0978, Cherries - WSU    EB1128, Peaches - WSU EB0914,
Apricots - WSU EB1240, Concord Grapes - WSU EB1615, Tart Cherries - MSU Research. Rpt. 220

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