Washington State University

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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