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Average
Annual Minimum Temperature Ranges By Zone
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According
to the USDA Hardiness Zone Chart, Houston lies mostly in zone
9a. The 'mostly' part comes in regarding our part of town where
the temperatures can fall into the 20's often enough to consider
us an 8b. The Texas Gardener's Chart at the Texas A&M Extension
Service puts the entire Houston area in their zone 3 (which equates
to zone 8 on the USDA chart).
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With
tender young plants, it is best to err on the side of caution
regarding the temperatures they can withstand. If you are dealing
with established 'woody' plants, there may be above-ground damage
but the roots may still be healthy.
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Our frost
dates are pretty easy to remember. Based on a 50 year average,
our first frost is just after December 7th (Pearl Harbor Day)
and our last frost is just before February 14th (Valentine's Day).
Just remember that these dates are based on averages and we can
have earlier or later frosts. In 2002, our last freeze came in
early April.
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