Critical Spring Temperatures for Tree Fruit Bud Development Stages

Critical Spring Temperatures for Tree Fruit Bud Development Stages

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March 30, 2021 - Questions about this information? Contact us.

Pome Fruit
Apples	Silver tip	Green Tip	½ inch green	Tight Cluster		First Pink	Full Pink			First Bloom		Full Bloom	Post Bloom
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
Stone Fruit
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

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