Canada's Plant Hardiness Site

Plant Hardiness Zone by Municipality

	1961-1990 zone	1981-2010 zone	1961-1990 hardiness index	1981-2010 hardiness index
Oakville	6a	6b	62	67
Oakwood	5a	5b	52	55
Oba	1b	2b	17	27
Odessa	5b	6a	56	60
Oil Springs	6a	6b	63	66
Oliphant	5b	6a	56	62
Omemee	5a	5b	52	56
Ompah	4a	5a	42	50
Onaping Falls	3b	4a	35	43
Opasatika	1b	2a	16	24
Orangeville	4b	5a	47	54
Orillia	5a	5b	51	58
Orléans	4b	5a	48	53
Orono	5b	6a	57	61
Orrville	4b	5a	46	52
Osgoode	5a	5b	50	56
Oshawa	5b	6a	58	63
Osnaburgh House	1b	2b	18	29
Ottawa	4b	5b	49	55
Otterville	5b	6a	59	64
Owen Sound	5b	6a	55	62