FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

FROST PATRICK B 		2. Issuer Name and Ticker or Trading Symbol

CULLEN FROST BANKERS INC [ CFR ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Pres., The Frost National Bank
(Last)          (First)          (Middle)

100 WEST HOUSTON STREET 		3. Date of Earliest Transaction (MM/DD/YYYY)

10/21/2008
(Street)

SAN ANTONIO, TX 78205
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, $0.01 par value   10/21/2008     A    4000   A $0.00   172484   D    
Common Stock, $0.01 par value                  630   I   (1) By Spouse  
Common Stock, $0.01 par value                  3855   I   Trustee for Children  
Common Stock, $0.01 par value                  43582   (2) I   Through Trust  
Common Stock, $0.01 par value                  1486.44   I   (3) Through Limited Liability Company  
Common Stock, $0.01 par value                  21429   I   Through 401(k) Plan  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy)   $52.44   10/21/2008     A     13000         (4) 10/21/2018   Common Stock   13000   $0.00   13000   D    

Explanation of Responses:
( 1)  Mr. Frost disclaims beneficial ownership of these shares.
( 2)  Reflects limited partnership ("LP") interests held by a trust of which Mr. Frost is the trustee. The number of shares reported assumes that each LP interest represents a proportionate interest in the shares of common stock in which the LP has a pecuniary interest.
( 3)  The number of shares reported assumes each limited liability company interest represents a proportionate interest in the shares of common stock in which the limited liability company has a pecuniary interest. Mr. Frost is the manager of the limited liability company.
( 4)  Vest 25% per year from Grant Date of 10-21-2008.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
FROST PATRICK B
100 WEST HOUSTON STREET
SAN ANTONIO, TX 78205 		X
Pres., The Frost National Bank

Signatures
/s/ Patrick B. Frost 10/23/2008
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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