The Maui group of the Sierra Club of Hawaii has an outing schedule here:
It is updated every three months.
You do not need to be a member to come on an outing, but you generally have to register with the leader of the hike in advance. Most hikes have a recommended donation of $3 for members and $5 for non-members.
There is also a Facebook page to make it easier to find out about upcoming hikes:
Join the Facebook group to be notified of new hikes and to include the hike schedule in your own calendar (e.g. Google Calendar).
Another group that puts together a schedule of hikes for several months in advance is Mauna Ala. Here are a couple of recent schedules:
- Mauna Ala hiking schedule – August 2015 – February 2016
- Mauna Ala hiking schedule – February – September 2016
- Mauna Ala hiking schedule – October 2016 – April 2017
- Mauna Ala hiking schedule – April – October 2017
- Mauna Ala hiking schedule – October 2017 – April 2018
- Mauna Ala hiking schedule – May 2018 – October 2018
- Mauna Ala hiking schedule – October 2018 – April 2019
- Mauna Ala hiking schedule – May 2019 – October 2019
- Mauna Ala hiking schedule – November 2019 – April 2020
Note that the latest one may not be here. Unlike Sierra Club, they don’t require advance registration for a hike and they don’t ask for a donation for the hike, but they require that you pay a $5 annual membership fee (or come as a guest of a member).
Friends of Haleakala National Park
They organize monthly service outings in the crater including two nights at cabins:
Auwahi Forest Restoration Project
The project includes a monthly service outing to plant natives plants in the Kahikinui area above the wind turbines:
Social media hike sites
Other places to look for hikes (they usually don’t announce them earlier than a week or two in advance):
Commercial hike companies
There are commercial hike organizers as well:
On your own
- Maui Guidebook
- Pride of Maui top 10 hikes
- Na Ala Hele trails (state-maintained)
- Also Na Ala Hele but easier to download individual trails
- https://hawaiitrails.hawaii.gov/trails (the latest and greatest Na Ala Hele trail site)
- Thesnorkelstore 4 spectacular hikes maui/
- Spectacular hikes around Hawaii
There are several books that include Maui trails, too.
If you go hiking on your own, I recommend sticking to the most popular trails to not risk getting lost, getting caught up in flash floods, or getting hassled for trespassing on private property. Maui trails are often much less well marked and maintained than ones other places I’ve been, but the popular ones will have people around and usually be safe. A good choice is one of the Na Ala Hele trails like the Waihee Ridge Trail.