Become a Member

Thornhill Society

Unlimited visits and guests. Support the Arboretum’s vision as a leading center of tree expertise, inspiring the world to plant and protect trees.

Thornhill Society

$1,500 per year

One-year membership

Level Benefits

In addition to the member benefits
listed below.

Access to the Arboretum

without timed-entry member passes

Unlimited access

for friends and family when entering with you

Free and unlimited

Acorn Express tram tour vouchers

10% discount

at the Ginkgo Restaurant and Café

Free dog admission during

Tails on the Trails and Dog Admission Days

Two double-discount days

in The Arboretum Store

Priority registration

for Summer Science Camp and education classes

Exclusive Thornhill Society

free and ticketed event opportunities

Recognition of your support

in the Perennial Report, Seasons member publication, and on the Visitor Center donor panel


to Greenmatters, the exclusive donor newsletter

Option to maximize support

by giving monthly

Membership Benefits

All memberships also enjoy the following benefits:

Access to a dedicated membership hotline


Free subscription

to Seasons quarterly publication

Free subscription

to ArbConnect e-newsletter

10% discount

at The Arboretum Store

15% discount

on education programs

Borrowing privileges

at the Sterling Morton Library

Reciprocal admission privileges

at more than 300 arboreta and botanical gardens across North America

Discounted rentals

to bicycle, snowshoe, and cross-country ski (subject to availability)

Make a Bigger Impact

When you join the exclusive Thornhill Society, you demonstrate that you share The Morton Arboretum’s vision as a leading center of tree expertise, inspiring the world to plant and protect trees.

Join now

Frequently Asked

See more questions
  • The Morton Arboretum is The Champion of Trees, blending science and splendor, providing beautiful landscapes where people can enjoy and learn about trees and nature. Every membership supports the Arboretum’s vital work to plant and protect trees for a greener, healthier, and more beautiful world.  Members receive special benefits, including free admission and parking, a 15% or greater discount on educational classes, 10% off most purchases at The Arboretum Store, reciprocal admission to more than 300 arboreta and botanical gardens, invitations to member-only events, and much more!

  • To purchase a gift membership online, select a membership level for your gift recipient. Then follow the prompts and complete your transaction. You may also purchase a gift membership on-site by visiting the Member Services Desk in the Arboretum’s Visitor Center, or by calling the Membership Hotline at 630-719-2453, which is available daily from 10:00 a.m. to 3:00 p.m.

  • To renew your membership online, you will need both your membership number (found on your membership card) and the last name of the primary cardholder on your membership account. Sign in to the portal, click the “renew” button, and follow the prompts.

  • The cost of membership to The Morton Arboretum is tax deductible to the extent allowed by law. The value of benefits received is insubstantial and the cost of membership is fully deductible. Please consult your tax advisor.

  • The Morton Arboretum is a member of the American Horticultural Society (AHS) and members of the Arboretum enjoy special admission privileges, in addition to possible discounts on gift shop purchases and special events at more than 330 botanical gardens and horticultural organizations across North America through the Reciprocal Admission Program (RAP). Check the state-by-state directory of participating gardens for participating organizations, or call the gardens prior to your visit. Please note that The Morton Arboretum follows the 90-mile exclusion rule, with the exception of the Chicago Botanic Garden.

Make a Gift

Your support has an impact for trees—locally and globally.

Give now