There's no fee to get in, but feel free to donate to their organization. It's mostly volunteers. And yes this is wheelchair accessible. Enjoy!
It has walkways very gentle no charge to enter .they ask for donations. It is run by south Seattle college.
When I went there, there was no entry fee. It is on the hill so there are some slopes and levels. So there are going to be some rough pathways but it's not that bad.
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