Colorado Scientific Society

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  Why Join?

  Mail-In Membership Application Form

  Online Membership Application Form

Founded in 1882, the Colorado Scientific Society promotes knowledge, the understanding of science, and its application to human needs, focusing primarily on earth science, but welcoming members with interests in all fields of science.

The objective of the Society is to advance science through scientific communication by sponsoring lectures, field trips, investigations, and discussions of scientific matters of public concern. In addition to regular membership, we have reduced fees for corresponding (non-Denver metro area) and student (college or university) members.

If paying electronically via PayPal using the buttons at right, you may submit your application/renewal form in parallel.

By e-mail:

  1. Download and complete the Word version of our application/renewal form by typing over the blanks.

  2. Attach a copy of your completed Word form to an e-mail addressed to the CSS treasurer.

  3. Before sending, please add the subject line "CSS membership" and include a brief indication of your mode of payment e.g., "Paid via PayPal." or "Check mailed separately.".

Please note that electronic form submission and payment are two separate processes under either option.

For questions, please contact CSS Treasurer Don Sweetkind at

As you pay your dues, please consider making an additional tax-deductible donation to a CSS fund:

CSS Memorial Funds support our student research grant program.
Options here include

Ogden Tweto Memorial Fund
Steven Oriel Memorial Fund
Edwin Eckel Memorial Fund
Bill Pierce-Heart Mountain Fund
George Snyder Memorial Fund
Chuck Pillmore Memorial Fund

Our Endowment Fund supports all other CSS programs and operating costs including our monthly meetings and newsletter, our ever-popular field trips, CSS family night, our annual Emmons Lecture, our GSA booth, and public outreach activities, to name just a few.

If including a donations in your dues payment, please indicate the donation amount explicitly. To donate via PayPal, please use the button at right.

All donations dated before January 1 of the following calendar year are 100% tax-deductible in the current tax year, as CSS is a fully qualified non-profit organization [Section 501 (c)(3)]. The CSS treasurer will provide a detailed receipt of your donation suitable for tax reporting purposes.

For questions, please contact CSS Treasurer Don Sweetkind at

Membership application form

PDF      MS Word

Already a Member?
Get your dues renewal form here

PDF         MS Word


Dues are for the calendar year and help support the newsletter, monthly meetings, two field trips per year, family night, and the Emmons Lecture.

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Simply click on the appropriate tab below and follow the prompts.  Secure and fast.

 Regular Membership - $20

Corresponding Membership - $10

Student Membership - $5



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