Just saw this on the Evergreen site.
Evergreen MTB Calendar
No trail building yet but invasive removal and clean up. If you want to get in at the start this is a good way to do it. Also it's nice to learn about what's choking our woods. Bonus points if you ride you bike and wear an Evergreen shirt.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Becon Bike Park WP