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Planting Zones in Ohio

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planting zones in Ohio

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the United States Department of

Agriculture USDA evaluated the growing

conditions across the United States and

Canada and developed an algorithm that

generated eleven agricultural zones

based upon average low temperatures USDA

zones two through ten are further

divided into sections a and B Ohio with

its winter temperatures of 0 to 20

degrees Fahrenheit

ladies and sones 5 & 6 zone 5a the USDA

hardiness zone 5a is present and only a

few small areas of Ohio the winter

temperatures can drop as low as 15 to 20

degrees below zero Fahrenheit the plants

grown in zone 5 a must be winter hardy

your winter temperatures may not be as

cold or you may provide protection for

the plants during the winter which

offers you a larger selection of plants

to grow in your area zone 5b most of

northern Ohio has annual minimum

temperatures of 10 to 15 degrees

Fahrenheit and is classified as USDA

hardiness zone 5b the average last frost

of the season ranges from March 30th to

April 30th the first frost of the season

generally comes in October plants

needing a long growing season such as

watermelon tomatoes and winter squash

should be started indoors 6 to 8 weeks

before the last expected frost date zone

6a

USDA hardiness zone 6a covers much of

the southern part of Ohio the winter

temperatures can drop to 10 degrees

below 0 F plants sold in nurseries and

greenhouses are generally marked with

growing requirements and the hardiness

zone a plant marked as Hardy from zone 6

through 9 can withstand the lower

temperatures of southern Ohio winters

but may not do well in the northern part

of the state zone 6b

along the Ohio River which borders

southern Ohio there is a small section

which is classified as USDA hardiness

zone 6b the winter temperatures may fall

to 5 below zero f during the coldest

part of the year because of the slightly

warmer temperatures the growing season

may be longer in hardiness zone 6b

fruits and vegetables have a longer time

to ripen as with any planting zone in

Ohio you must determine the microclimate

of your garden area before planting

microclimates the hardiness zones are a

guideline for gardeners to use when

planning a garden however the elements

and other outside factors may create a

bubble around your growing area these

bubbles are called microclimates high

winds or excessive rainfall may lower

the annual average temperature for your

growing area this means that you may

live in hardiness zone 6a but have

temperatures more in line with zone 5b

large cities often have higher

temperatures than outlying suburbs and

therefore the microclimate may be

different than what is on the map to

determine your planting zone track the

annual low temperatures match the

temperature records with the USDA

hardiness zone map for planting a

successful garden

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