I grew Blacktail Mountain this year, along with Grover Delaney watermelon.
We had a bad summer that started much later than usual and had cold nights almost until July. This didn't help growing any melons here in PNW. Actually, 75% of my cucumber plants died in June due to cold nights. Melons were grown in cold frames, so they survived for the most part.
Anyway, I got 2 decent ripe fruits from the Blacktail Mountain quite late in Sept. Grovery Delaney was much more productive, earlier, and sweeter!
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First I was taken by surprise to see the Grover Delayney flesh being very light pink color - first I thouhgt it was not ripe. But it was very sweet and tasted ripe to me. I guess it is just the flesh color.
Blacktail Mountain's flesh was bright red, but the sweetness was not there.
Here are the fruit pictures on Aug 31, 2007:
Grover Delaney:
Blacktail Mountain (same date):
Regards,