Fuse Duluth has an e-mail newsletter that lists volunteer opportunities. A few from the recent list are:

Churches United in Ministry 
Help to get food stored in its Central Hillside location over to the West End food shelf. 

Bentleyville Tour of Lights 
Numerous opportunities obviously not needed until winter.
 
Camp Miller
Volunteer for a week as a nurse.
 
Let's Ride 
Volunteers are needed to get the horses ready before classes. 

Community Action Duluth -- Seeds of Success 
Lend a hand at tilling, fence construction, planting, watering, weeding, harvesting and processing. 
 
Pick a Day
Show up at the work site and help keep Duluth clean. Mulch flowers and shrub beds, weed flower gardens, pick up trash, etc.
 
Men as Peacemakers
Mentor a student through playing sports and games, eating lunch together, reading or helping with school work. 
 
Move to End Alzheimer's
Donate time, energy and passion forming Memory Walk Teams and/or sponsorships for the Duluth area walk.

If anyone needs more info or contact names and numbers for any of those, you can go through Fuse Duluth or just mention what you're curious about in the comments here and I can pull the data out for you.

Also, Friends of the Parks is always looking for people to work on trails. Contact Judy Gibbs at 391-0886.

Another place to look for volunteer opportunities is the Waterfront Area Volunteer Organization.

There is a big need for volunteers at the Treasure Adventure by International Explorations, coming up July 24 to Aug. 8 at the old LeFarge Cement terminal next to Bayfront Park.

They are looking for setup and tear-down crew, greeters, traffic directors, security, stage and tech crew members, actors, garbage picker uppers and so on. Click for details.