UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2025

SKEENA RESOURCES LIMITED

(Translation of Registrant’s Name intoEnglish)

001-40961

(Commission File Number)

1133 Melville Street, Suite 2600, Vancouver,British Columbia, V6E 4E5, Canada

(Address of Principal Executive Offices)

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

Form 20-F¨          Form 40-Fx

DOCUMENTS INCLUDED AS PART OF THIS FORM 6-K

Exhibit 99.1 to this report, furnished onForm 6-K, is furnished, not filed, and will not be incorporated by reference into any registration statement filed by the registrantunder the Securities Act of 1933, as amended.

EXHIBIT INDEX

SIGNATURES

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.

Date: October 8, 2025

Exhibit 99.1

SkeenaResources Closes C$143.8 Million Bought Deal Financing

Vancouver,BC (October 8, 2025) Skeena Resources Limited (TSX: SKE, NYSE: SKE) (“Skeena Gold & Silver”, “Skeena”or the “Company”) is pleased to announce the closing of the previously announced bought deal offering of 5,991,500 commonshares of the Company (the “Common Shares”), at a price of C$24.00 per Common Share (the “Offering Price”)for gross proceeds of C$143,796,000 (the “Offering”), which includes the exercise in full by the underwriters of theirover-allotment option to purchase up to an additional 781,500 Common Shares at the Offering Price.

TheCommon Shares are offered by way of a prospectus supplement to the Company’s base shelf prospectus (the “Base Shelf Prospectus”)in all of the provinces of Canada, excluding Quebec. The Common Shares are also offered by way of a U.S. prospectus supplement to theCompany’s registration statement on Form F-10 (including the Base Shelf Prospectus) in the United States.

BMOCapital Markets acted as sole bookrunner for the Offering, on behalf of a syndicate of underwriters which includes UBS Securities CanadaInc., Raymond James Ltd., RBC Dominion Securities Inc., TD Securities Inc., CIBC World Markets Inc., SCP Resource Finance LP, AgentisCapital Markets (First Nations Financial Markets LP), Canaccord Genuity Corp. and Desjardins Securities Inc.

Theproceeds raised from the sale of the Common Shares will be used for continued advancement of the Company’s Eskay Creek gold-silverproject and for general corporate purposes.

Thisnews release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of the CommonShares in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under thesecurities laws of that jurisdiction.

AboutSkeena

Skeenais a leading precious metals developer that is focused on advancing the Eskay Creek Gold-Silver Project – a past producing minelocated in the renowned Golden Triangle in British Columbia, Canada. Eskay Creek will be one of the highest-grade and lowest cost open-pitprecious metals mines in the world, with substantial silver by-product production that surpasses many primary silver mines. Skeena iscommitted to sustainable mining practices and maximizing the potential of its mineral resources. In partnership with the Tahltan Nation,Skeena strives to foster positive relationships with Indigenous communities while delivering long-term value and sustainable growth forits stakeholders.

ContactInformation:

GalinaMeleger

Vice PresidentInvestor Relations

E: info@skeenagold.com

T: 604-684-8725

Cautionarynote regarding forward-looking statements

Certainstatements and information contained or incorporated by reference in this news release constitute “forward-looking information”and “forward-looking statements” within the meaning of applicable Canadian and United States securities legislation (collectively, “forward-looking statements”). These statements relate to future events or our future performance. The use of words suchas “anticipates”, “believes”, “proposes”, “contemplates”, “generates”, “targets”, “is projected”, “is planned”, “considers”, “estimates”, “expects”, “isexpected”, “potential” and similar expressions, or statements that certain actions, events or results “may”, “might”, “will”, “could”, or “would” be taken, achieved, or occur, may identify forward-lookingstatements. All statements other than statements of historical fact are forward-looking statements. Specific forward-looking statementscontained herein include, but are not limited to, the use of proceeds from the Offering; plans to advance the Eskay Creek gold-silverproject to production; processing capacity of the mine; ongoing relationships with its stakeholders, including Indigenous communities;anticipated costs of the mine; anticipated by-products of the mine; and the Company’s milestones. Such forward-looking statementsrepresent the Company’s management expectations, estimates and projections regarding future events or circumstances on the datethe statements are made, and are necessarily based on several estimates and assumptions that, while considered reasonable by the Companyas of the date hereof, are not guarantees of future performance. Actual events and results may differ materially from those describedherein, and are subject to significant operational, business, economic, and regulatory risks and uncertainties. The risks and uncertaintiesthat may affect the forward-looking statements in this news release include, among others: the inherent risks involved in explorationand development of mineral properties, including permitting and other government approvals; changes in economic conditions, includingchanges in the price of gold and other key variables; changes in mine plans and other factors, including accidents, equipment breakdown,bad weather and other project execution delays, many of which are beyond the control of the Company; environmental risks and unanticipatedreclamation expenses; and other risk factors identified in the Company’s MD&A for the year ended December 31, 2024, itsMD&A for the six months ended June 30, 2025, the Company’s Annual Information Form dated March 31, 2025, theCompany’s short form base shelf prospectus dated March 19, 2025, and in the Company’s other periodic filings with securitiesand regulatory authorities in Canada and the United States that are available on SEDAR+ at www.sedarplus.ca or on EDGAR at www.sec.gov.

Readersshould not place undue reliance on such forward-looking statements. Any forward-looking statement speaks only as of the date on whichit is made and the Company does not undertake any obligations to update and/or revise any forward-looking statements except as requiredby applicable securities laws.