when was the usda hardiness zone change

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when was the usda hardiness zone change	1.73	0.4	4849	20	39
when	1.06	0.6	1904	78	4
was	0.19	1	9468	82	3
the	1.27	1	774	65	3
usda	1.14	0.8	6535	93	4
hardiness	0.85	0.2	591	24	9
zone	1.78	0.3	2416	99	4
change	1.81	0.9	1700	48	6

Keyword	CPC	PCC	Volume	Score
when was the usda hardiness zone change	1.93	0.4	6304	19
usda plant hardiness zone map climate change	1.18	0.9	121	43
usda plant hardiness zone map changes	0.59	0.6	364	54
usda hardiness zone map changes	1.66	0.3	5958	14
usda hardiness zone changes	1.36	1	8514	98
usda unveiled a new hardiness zone map	1.79	0.7	8589	32
usda hardiness zones updated	1.22	0.7	1518	27
usda hardiness zones 1990	0.69	0.5	1027	93
new hardiness zone map usda	1.92	0.2	4613	77
usda plant hardiness zone map 1990	0.18	1	2550	72
newest usda hardiness zone map	1.93	0.5	6714	18
new us hardiness zone	0.01	0.1	8136	39
new usda plant hardiness zones	0.28	0.1	7983	43
usda updated plant hardiness zones	1.87	0.5	9498	28