EXHIBIT 25.1
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                                    FORM T-1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            STATEMENT OF ELIGIBILITY
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                    CORPORATION DESIGNATED TO ACT AS TRUSTEE

                                    ---------

                      CHECK IF AN APPLICATION TO DETERMINE
           ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) [ ]

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                     WELLS FARGO BANK, NATIONAL ASSOCIATION
               (Exact name of trustee as specified in its charter)

Not Applicable                                       94-1347393
(State of incorporation                              I.R.S. employer
if not a U.S. national bank)                         identification no.)

505 Main Street, Suite 301
Fort Worth, Texas                                    76102
(Address of principal executive offices)             (Zip code)

                              Wells Fargo & Company
                          Law Department, Trust Section
                                  MAC N9305-172
                         Sixth and Marquette, 17th Floor
                              Minneapolis, MN 55479
                              (agent for services)

                                    ---------

                            FRONTIER OIL CORPORATION
               (Exact name of obligor as specified in its charter)

Wyoming                                              74-1895085
(State or other jurisdiction of                      (I.R.S. employer
incorporation or organization)                       identification no.)


10000 Memorial Drive, Suite 600
Houston, Texas                                       77024
(Address of principal executive offices)             (Zip code)

                         Frontier Oil & Refining Company
               (Exact name of obligor as specified in its charter)

Delaware                                             84-1018461
(State or other jurisdiction of                      (I.R.S. employer
incorporation or organization)                       identification no.)

10000 Memorial Drive, Suite 600
Houston, Texas                                       77024
(Address of principal executive offices)             (Zip code)


                       Frontier Refining & Marketing Inc.
               (Exact name of obligor as specified in its charter)

Delaware                                             22-2899938
(State or other jurisdiction of                      (I.R.S. employer
incorporation or organization)                       identification no.)

10000 Memorial Drive, Suite 600
Houston, Texas                                       77024
(Address of principal executive offices)             (Zip code)


                             Frontier Holdings Inc.
               (Exact name of obligor as specified in its charter)

Delaware                                             13-3504072
(State or other jurisdiction of                      (I.R.S. employer
incorporation or organization)                       identification no.)

10000 Memorial Drive, Suite 600
Houston, Texas                                       77024
(Address of principal executive offices)             (Zip code)


                             Frontier Refining Inc.
               (Exact name of obligor as specified in its charter)

Delaware                                             22-2899378
(State or other jurisdiction of                      (I.R.S. employer
incorporation or organization)                       identification no.)

10000 Memorial Drive, Suite 600
Houston, Texas                                       77024
(Address of principal executive offices)             (Zip code)

                       Frontier El Dorado Refining Company
               (Exact name of obligor as specified in its charter)

Delaware                                             91-2002334
(State or other jurisdiction of                      (I.R.S. employer
incorporation or organization)                       identification no.)

10000 Memorial Drive, Suite 600
Houston, Texas                                       77024
(Address of principal executive offices)             (Zip code)


                             Frontier Pipeline Inc.
               (Exact name of obligor as specified in its charter)

Delaware                                             93-1023412
(State or other jurisdiction of                      (I.R.S. employer
incorporation or organization)                       identification no.)

10000 Memorial Drive, Suite 600
Houston, Texas                                       77024
(Address of principal executive offices)             (Zip code)

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                          6.625% Senior Notes due 2011
                       (Title of the indenture securities)

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Item 1. General Information. Furnish the following information as to the
trustee:

    (a) Name and address of each examining or supervising authority to which it
        is subject.

      Comptroller of the Currency,
      Treasury Department
      Washington, D.C. 20230

      Federal Deposit Insurance Corporation
      Washington, D.C. 20429

      Federal Reserve Bank of San Francisco
      San Francisco, CA 94120

    (b) Whether it is authorized to exercise corporate trust powers.

      The trustee is authorized to exercise corporate trust powers.

Item 2. Affiliations with Obligor. If the obligor is an affiliate of the
trustee, describe each such affiliation.

    None with respect to the trustee.

No responses are included for Items 3-14 of this Form T-1 because the obligor is
not in default as provided under Item 13.

Item 15. Foreign Trustee. Not applicable.

Item 16. List of Exhibits.

Wells Fargo Bank incorporates by reference into this Form T-1 exhibits attached
hereto.

Exhibit 1. A copy of the Articles of Association of the trustee now in
           effect.*

Exhibit 2. A copy of the Comptroller of the Currency Certificate of Corporate
           Existence for Wells Fargo Bank, National Association, dated
           November 28, 2001.*

Exhibit 3. A copy of the authorization of the trustee to exercise corporate
           trust powers. A copy of the Comptroller of the Currency Certificate
           of Corporate Existence (with Fiduciary Powers) for Wells Fargo Bank,
           National Association, dated November 28, 2001.*

Exhibit 4. Copy of By-laws of the trustee as now in effect.*

Exhibit 5. Not applicable.

Exhibit 6. The consents of United States institutional trustees required by
           Section 321(b) of the Act.

Exhibit 7. Attached is a copy of the latest report of condition of the
           trustee published pursuant to law or the requirements of its
           supervising or examining authority.

Exhibit 8. Not applicable.

Exhibit 9. Not applicable.

*   Incorporated by reference to exhibit number 25 filed with registration
    statement number 333-87398.

                                    SIGNATURE

      Pursuant to the requirements of the Trust Indenture Act of 1939, as
amended, the trustee, Wells Fargo Bank, National Association, a national banking
association organized and existing under the laws of the United States of
America, has duly caused this statement of eligibility to be signed on its
behalf by the undersigned, thereunto duly authorized, all in the City of Fort
Worth and State of Texas on the 21st day of October, 2004.

                                          WELLS FARGO BANK, NATIONAL ASSOCIATION

                                          By: /s/ Mark Dunn
                                              ----------------------------------
                                              Mark Dunn, Vice President

                                    Exhibit 6

October 21, 2004

Securities and Exchange Commission
Washington, D.C. 20549

Gentlemen:

      In accordance with Section 321(b) of the Trust Indenture Act of 1939, as
amended, the undersigned hereby consents that reports of examination of the
undersigned made by Federal, State, Territorial, or District authorities
authorized to make such examination may be furnished by such authorities to the
Securities and Exchange Commission upon its request thereof.

                                          Very truly yours,

                                          WELLS FARGO BANK, NATIONAL ASSOCIATION

                                          By: /s/ Mark Dunn
                                              ----------------------------------
                                              Mark Dunn, Vice President

                                    Exhibit 7

                       Consolidated Report of Condition of

                      Wells Fargo Bank National Association
               of 101 North Phillips Avenue, Sioux Falls, SD 57104
                     And Foreign and Domestic Subsidiaries,
        at the close of business June 30, 2004, filed in accordance with
                     12 U.S.C. ss. 161 for National Banks.



                                                                                              Dollar Amounts
                                                                                                In Millions
                                                                                              --------------
                                                                                        
ASSETS
Cash and balances due from depository institutions:
         Noninterest-bearing balances and currency and coin                                     $ 13,514
         Interest-bearing balances                                                                 6,815
Securities:
         Held-to-maturity securities                                                                   0
         Available-for-sale securities                                                            31,813
Federal funds sold and securities purchased under agreements to resell:
         Federal funds sold in domestic offices                                                    1,295
         Securities purchased under agreements to resell                                              72
Loans and lease financing receivables:
         Loans and leases held for sale                                                           38,430
         Loans and leases, net of unearned income                                236,685
         LESS: Allowance for loan and lease losses                                 2,551
         Loans and leases, net of unearned income and allowance                                  234,134
Trading Assets                                                                                     4,575
Premises and fixed assets (including capitalized leases)                                           3,194
Other real estate owned                                                                              201
Investments in unconsolidated subsidiaries and associated companies                                  289
Customers' liability to this bank on acceptances outstanding                                          78
Intangible assets
         Goodwill                                                                                  8,415
         Other intangible assets                                                                   9,260
Other assets                                                                                      12,613
                                                                                                --------
Total assets                                                                                    $364,698
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LIABILITIES
Deposits:
         In domestic offices                                                                    $255,500
                  Noninterest-bearing                                             79,405
                  Interest-bearing                                               176,095
         In foreign offices, Edge and Agreement subsidiaries, and IBFs                            19,351
                  Noninterest-bearing                                                  3
                  Interest-bearing                                                19,348
Federal funds purchased and securities sold under agreements to repurchase:
         Federal funds purchased in domestic offices                                              15,599
         Securities sold under agreements to repurchase                                            2,920

Trading liabilities                                                                                3,575
Other borrowed money
         (includes mortgage indebtedness and obligations under capitalized leases)                17,550
Bank's liability on acceptances executed and outstanding                                              78
Subordinated notes and debentures                                                                  4,541
Other liabilities                                                                                 12,296
                                                                                                --------
Total liabilities                                                                               $331,410

Minority interest in consolidated subsidiaries                                                        54

EQUITY CAPITAL
Perpetual preferred stock and related surplus                                                          0
Common stock                                                                                         520
Surplus (exclude all surplus related to preferred stock)                                          24,182
Retained earnings                                                                                  8,088
Accumulated other comprehensive income                                                               444
Other equity capital components                                                                        0
                                                                                                --------
Total equity capital                                                                              33,234
                                                                                                --------
Total liabilities, minority interest, and equity capital                                        $364,698
                                                                                                ========


I, James E. Hanson, Vice President of the above-named bank do hereby declare
that this Report of Condition has been prepared in conformance with the
instructions issued by the appropriate Federal regulatory authority and is true
to the best of my knowledge and belief.

                                                                 James E. Hanson
                                                                  Vice President


We, the undersigned directors, attest to the correctness of this Report of
Condition and declare that it has been examined by us and to the best of our
knowledge and belief has been prepared in conformance with the instructions
issued by the appropriate Federal regulatory authority and is true and correct.


Dave Hoyt
Dave Munio                Directors
Carrie Tolstedt