US Zone Map

For your convenience, we have reproduced the new USDA Plant Hardiness Map. The hardiness zones are based on the average annual low temperature for each zone. Many factors, such as altitude, snow cover, degree of exposure to wind, proximity to bodies of water, excessive or minimal rainfall, soil types, etc. can create variations within zones. Please understand that these abnormalities can adversely affect your wildflowers. Thus, the spring and fall planting dates published on this page should be considered generalizations. The above factors have a dramatic effect on predicting precise sowing dates for each zone.

Range of average annual minimum temperatures for each zone with recommended spring or fall sowing dates for wildflowers.

ZONE 1	below -50º	Sow seed in early spring when soil can be worked
ZONE 2	-50º to -40º	Sow seed in early spring when soil can be worked
ZONE 3	-40º to -30º	Spring: April15 to June 15	Fall: Dormant Planting. When soil temperature remain below 50º
ZONE 4	-30º to -20º	Spring: April 15 to June 15	Fall: Dormant Planting. When soil temperature remain below 50º
ZONE 5	-20º to 10º	Spring: April 15 to June 15	Fall: Dormant Planting. When soil temperature remain below 50º
ZONE 6	-10º to 0º	Spring: March 15 to May 15	Fall: Dormant Planting. When soil temperature remain below 50º
ZONE 7	0º to10º	A Fall planting is recommended	Fall: Sept 15- Nov 15
ZONE 8	10º to 20º	A Fall planting is recommended	Fall: Oct 1 --Dec 1
ZONE 9	20º to 30º	A Fall planting is recommended	Fall: Sept 15--Dec 15
ZONE 10	30º to 40º	A Fall planting is recommended	Fall: Oct 1-- Dec 15
ZONE 11	ABOVE 40º	A Fall planting is recommended	Fall: Oct 1-- Dec 15

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If you have any comments on this site contact webmaster This page was updated Monday, July 07, 2008