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 State University (WSU), and Michigan State University Extension (MSU) 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