Friday, June 19, 2026

Opening Day 2026

• Demonstration Monarch Tagging

• Rain or shine

• Free and Open to the Public

We tag Monarch butterflies (Danaus plexippus) as part of programs like Monarch Watch. A small, lightweight, coded tag is gently applied to the underside of a butterfly's hindwing. These tags do not harm the butterfly or affect its flight.

The primary purpose of tagging is to track the incredible multi-generational migration of eastern Monarchs from breeding grounds across North America (including Maine) to their overwintering sites in the mountains of central Mexico—a journey of up to 3,000 miles for individual butterflies.

By recording the tag codes when butterflies are captured and tagged here in Southwest Harbor, and then reporting any recaptures or sightings farther south along the route (or at overwintering sites), scientists can piece together valuable data. This includes:

• The origins of butterflies reaching the winter colonies

• Migration timing, pace, and routes

• Survival rates and mortality during the journey

• Geographic patterns and changes over time

This information helps researchers understand population dynamics, identify threats to the species (such as habitat loss), and inform conservation efforts to protect Monarchs.

Thursday, July 30, 2026

28th Annual Butterfly Release

The Annual Butterfly Release is divided into two sessions to ensure that guests can enjoy all of the activities and stroll through the park at their own pace, allowing families and individuals to come and go at their leisure during their session time.

When you check-in, you will receive your boxed butterflies to release at the park or take home. Enjoy refreshments and fun activities for all ages. This annual fundraising effort is used to support all the activities and upkeep at the park, and pays for new plantings downtown. We are excited to once again be able to share the magic of butterflies with you this season and appreciate your support. Tickets are limited and advance ticket purchase is required to attend.

Time Options:

• Session I - 1:00 PM - 2:30 PM

• Session II - 2:30 PM - 4:00 PM

Cost:

• Donation $35/person 12 yrs. & older (includes one butterfly)

• Free Admission for children under 12 yrs. (butterfly not included)

How to Purchase:

• Use the secure Pay Pal link below. You can select the session time and the quantity of tickets.

• Tickets are also available at the Southwest Harbor Chamber of Commerce - 329 Main Street.