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We put our houseplants out on April 15. They generally come back inside between late October and early December. We seldom actually get a freeze that truly freezes the ground, which makes the Fire Ants very happy.
We may get frost next Monday from that Doesn't matter if we get a "killing freeze" this early, in all honesty. Everything would likely just come back in a few days.
This is the official data at NWS.gov
Seattle
first freeze Nov 17
last freeze Mar 10
growing season 251 days
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