You can do it anytime of the year, but in winter (December to February) the top can be closed due to snow or storm.
But the weather on the island, especially on the west coast is great year round. When I wanted to do MK, it was closed due to snow. I did Mauna Loa instead. Not nearly as challenging and I had a spare MTB on the back of the truck with no use.
But it started to snow at the peak once I arrived, so better bring a warm jacket, arm and leg warmers.
Here is my full experience:
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