I think your growing technique will be just as important as the variety you select. Starting seeds indoors, raised beds, black plastic mulch, and low tunnels/row covers will all help.
Baker Creek lists Blacktail Mountain as 70 days to maturity. The best watermelon where I live is Sangria. I'm seeing it listed as 87 days. I think the methods I listed above would give you the chance to grow any variety you wanted.
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