6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OFFOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of June 2024

Commission File No. 001-39974

WEST FRASER TIMBER CO. LTD.

(Translation of registrant’s name into English)

885 WestGeorgia Street, Suite 1500

Vancouver, British Columbia

Canada V6C 3E8

(Addressof principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F

Form 20-F****☐    Form 40-F ☒

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1) ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7) ☐

SUBMITTED HEREWITH

-2-

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Dated: June 27, 2024

EX-99.1

Exhibit 99.1

For Immediate Release

Notice of Second Quarter Results Conference Call

VANCOUVER, B.C., June 27, 2024 – West Fraser Timber Co. Ltd. (“West Fraser” or the “Company”) (TSX and NYSE: WFG) will hold an analysts’ conference call to discuss second quarter 2024 financial and operating results on Thursday, July 25, 2024 at 8:30 a.m. Pacific Time/11:30 a.m. Eastern Time.

To participate in the call, please dial: 1-888-390-0605 (Toll-free North America) or (416) 764-8609 (Toll number) or connect on the webcast.

Please let the operator know you wish to participate in the West Fraser conference call chaired by Mr. Sean McLaren, President and Chief Executive Officer.

Following management’s discussion of the quarterly results, the analyst community will be invited to ask questions.

The call will be recorded for webcasting purposes and will be available on our website at www.westfraser.com. West Fraser’s second quarter 2024 financial and operating results will be released on Wednesday, July 24, 2024.

About West Fraser

West Fraser is a diversified wood products company with more than 60 facilities in Canada, the United States, the United Kingdom, and Europe. The Company produces lumber, engineered wood products (OSB, LVL, MDF, plywood, and particleboard), pulp, newsprint, wood chips, other residuals, and renewable energy from responsibly sourced wood fibre. West Fraser’s products are used in home construction, repair and remodelling, industrial applications, papers, tissue, and box materials. For more information about West Fraser, visit: westfraser.com.

ForMore Information

Investor Contact

Robert B. Winslow, CFA

Director, Investor Relations & Corporate Development

Tel. (416) 777-4426

shareholder@westfraser.com

Media Contact

Joyce Wagenaar

Director, Communications

Tel. (604) 817-5539

media@westfraser.com