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UNITEDSTATES
SECURITIESANDEXCHANGECOMMISSION
Washington,D.C.20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-21177

Name of Fund: BlackRock California Insured Municipal Income Trust (BCK)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Anne F. Ackerley, Chief Executive Officer, BlackRock
California Insured Municipal Income Trust, 55 East 52nd Street, New York, NY 10055.

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

Date of fiscal year end: 08/31/2010

Date of reporting period: 11/30/2009

Item 1 – Schedule of Investments

BlackRock California Insured Municipal Income Trust (BCK)     
Schedule of Investments November 30, 2009  (Percentages shown are based on Net Assets) 
      Par   
  Municipal Bonds    (000)  Value 
California - 126.3%         
County/City/Special District/  Benicia Unified School District, GO, CAB, Series B     
School District - 70.8%  (MBIA), 5.54%, 8/01/23 (a)    $ 6,500 $  2,933,060 
  Central Unified School District, GO, Election of 2008,     
  Series A (AGC), 5.63%, 8/01/33    400  424,308 
  Ceres Unified School District, GO, CAB, Election of     
  2001, Series B (MBIA), 5.91%, 8/01/30 (a)  3,055  795,033 
  Ceres Unified School District, GO, CAB, Election of     
  2001, Series B (MBIA), 5.92%, 8/01/31 (a)  3,180  760,879 
  Ceres Unified School District, GO, CAB, Election of     
  2001, Series B (MBIA), 5.92%, 8/01/32 (a)  3,300  732,699 
  Ceres Unified School District, GO, CAB, Election of     
  2001, Series B (MBIA), 5.92%, 8/01/33 (a)  3,440  709,844 
  Ceres Unified School District, GO, CAB, Election of     
  2001, Series B (MBIA), 5.89%, 8/01/34 (a)  3,575  683,576 
  Ceres Unified School District, GO, CAB, Election of     
  2001, Series B (MBIA), 5.90%, 8/01/35 (a)  3,275  581,247 
  County of Kern California, COP, Capital Improvements     
  Projects, Series A (AGC), 6.00%, 8/01/35  1,500  1,640,295 
  Evergreen Elementary School District, GO, Election of     
  2006, Series B (AGC), 5.13%, 8/01/33  5,000  5,039,450 
  Fontana Unified School District California, GO, Election     
  of 2006, Series B (FSA), 5.25%, 8/01/26  5,400  5,731,506 
  Fontana Unified School District California, GO, Series A     
  (FSA), 5.25%, 8/01/31    2,000  2,034,600 
  Glendale Community College District California, GO,     
  Election of 2002, Series D (MBIA), 5.00%, 11/01/31  2,500  2,524,650 
  Long Beach Unified School District California, GO,     
  Refunding, Election of 2008, Series A, 5.75%, 8/01/33  1,000  1,071,930 
  Los Angeles Community College District California, GO,     
Election of 2001, Series A (MBIA), 5.00%,
  8/01/32    3,500  3,513,020 
  Murrieta Valley Unified School District Public Financing     
  Authority, Special Tax Bonds, Refunding, Series A     
  (AGC), 5.13%, 9/01/26    1,000  1,049,040 
  Pittsburg Unified School District, GO, Election of 2006,     
  Series B (FSA), 5.50%, 8/01/34    2,000  2,088,100 
Portfolio Abbreviations         

To simplify the listings of portfolio holdings in the Schedule of Investments, the names and descriptions of many of the
securities have been abbreviated according to the following list.

AGC  Assured Guaranty Corp.  FSA  Financial Security Assurance Inc. 
AMBAC  American Municipal Bond  GO  General Obligation Bonds 
  Assurance Corp.  MBIA  Municipal Bond Investors Assurance 
CAB  Capital Appreciation Bonds    (National Public Finance Guaranty Corp.) 
COP  Certificates of Participation  RB  Revenue Bonds 

1

BlackRock California Insured Municipal Income Trust (BCK)     
Schedule of Investments November 30, 2009  (Percentages shown are based on Net Assets) 
       Par   
  Municipal Bonds    (000)  Value 
  Riverside Unified School District California, GO, Series A     
  (MBIA), 5.00%, 2/01/27    $ 5,000 $  5,033,150 
  San Bernardino Community College District California,     
  GO, Election of 2002, Series C (FSA), 5.00%, 8/01/31  2,000  2,019,060 
  San Jose Financing Authority, Refunding RB, Civic     
  Center Project, Series B (AMBAC), 5.00%, 6/01/37  6,000  6,008,340 
  San Leandro Unified School District California, GO,     
  Election of 2006, Series B (FSA), 6.25%, 8/01/29  1,125  1,283,164 
  Snowline Joint Unified School District, COP, Refunding,     
  Refining Project (AGC), 5.75%, 9/01/38  2,000  2,172,400 
  Westminster Redevelopment Agency California, Tax     
Allocation Bonds, Subordinate, Commercial
  Redevelopment Project No. 1 (AGC), 6.25%, 11/01/39  2,000  2,237,880 
        51,067,231 
Education - 7.1%  California Educational Facilities Authority, RB, Scripps     
  College (MBIA), 5.00%, 8/01/31    2,385  2,562,611 
  University of California, RB, Limited Project, Series D     
  (FSA), 5.00%, 5/15/41    2,600  2,527,668 
        5,090,279 
State - 3.7%  State of California, GO, Various Purpose, 6.50%,     
  4/01/33    2,500  2,682,300 
Transportation - 6.7%  County of Orange California, RB, Series B, 5.75%,     
  7/01/34    1,000  1,074,560 
  San Joaquin Hills Transportation Corridor Agency     
  California, Refunding RB, CAB, Series A (MBIA), 5.49%,     
  1/15/31(a)    20,000  3,767,800 
        4,842,360 
Utilities - 38.1%  California State Department of Water Resources,     
  Refunding RB, Central Valley Project, Series AE, 5.00%,     
  12/01/28    2,500  2,641,775 
  City of Los Angeles California, Refunding RB, Series A     
  (MBIA), 5.00%, 6/01/32    4,000  4,029,880 
  City of Los Angeles California, Refunding RB, Sub-Series     
  A (MBIA), 5.00%, 6/01/27    5,000  5,083,400 
  City of Napa California, RB (AMBAC), 5.00%, 5/01/35  3,000  3,023,910 
  East Bay Municipal Utility District, RB, Series A (MBIA),     
  5.00%, 6/01/37    4,000  4,128,720 
  East Bay Municipal Utility District, RB, Sub-Series A     
  (MBIA), 5.00%, 6/01/35    3,000  3,084,180 
  Los Angeles Department of Water & Power, RB, System,     
  Sub-Series A-2 (FSA), 5.00%, 7/01/35  500  506,695 
  Metropolitan Water District of Southern California, RB,     
  Series B-2 (MBIA), 5.00%, 10/01/27  1,750  1,887,760 
  Orange County Sanitation District, COP, Series B (FSA),     
  5.00%, 2/01/37    3,000  3,059,550 
        27,445,870 
  Total Municipal Bonds - 126.4%    91,128,040 

2

BlackRock California Insured Municipal Income Trust (BCK)     
Schedule of Investments November 30, 2009  (Percentages shown are based on Net Assets) 
  Municipal Bonds Transferred to  Par   
  Tender Option Bond Trusts (b)  (000)   Value 
County/City/Special District/  Los Angeles Community College District California, GO,     
School District - 12.9%  Election of 2001, Series A (FSA), 5.00%, 8/01/32  $ 3,000 $  3,014,970 
  Los Angeles Community College District California, GO,     
  Election of 2008, Series A, 6.00%, 8/01/33  3,828  4,230,106 
  San Diego Community College District California,     
  GO, Election of 2002, 5.25%, 8/01/33  2,004  2,062,303 
        9,307,379 
Education - 3.4%  University of California, RB, Series O, 5.75%, 5/15/34  2,205  2,436,834 
Utilities - 13.2%  San Diego County Water Authority, COP, Refunding,     
  Series 2008-A (FSA), 5.00%, 5/01/33  4,250  4,192,115 
  San Diego County Water Authority, COP, Refunding,     
  Series A (MBIA), 5.00%, 5/01/32  5,292  5,336,231 
        9,528,346 
  Total Municipal Bonds Transferred to     
  Tender Option Bond Trusts - 29.5%    21,272,559 
  Total Long-Term Investments       
  (Cost - $113,617,261) - 155.9%    112,400,599 
  Short-Term Securities    Shares   
  CMA California Municipal Money Fund, 0.04% (c)(d)  512,901  512,901 
  Total Short-Term Securities       
  (Cost - $512,901) - 0.7%      512,901 
  Total Investments (Cost - $114,130,162*) - 156.6%    112,913,500 
  Other Assets Less Liabilities - 2.1%    1,521,229 
  Liability for Trust Certificates, Including Interest     
  Expense and Fees Payable - (15.2)%  (10,995,570) 
  Preferred Shares, at Redemption Value - (43.5)%  (31,328,125) 
  Net Assets Applicable to Common Shares - 100.0%  $ 72,111,034 

* The cost and unrealized appreciation (depreciation) of investments as of November 30, 2009, as
computed for federal income tax purposes, were as follows:

Aggregate cost  $ 103,138,424 
Gross unrealized appreciation  $ 2,827,085 
Gross unrealized depreciation  (4,041,214) 
Net unrealized depreciation  $ (1,214,129) 

(a) Represents a zero-coupon bond. Rate shown reflects the current yield as of report date.
(b) Securities represent bonds transferred to a tender option bond trust in exchange for which the Trust
acquired residual interest certificates. These securities serve as collateral in a financing
transaction.

(c) Investments in companies considered to be an affiliate of the Trust, for purposes of Section 2(a)(3) of
the Investment Company Act of 1940, were as follows:

       Affiliate  Net Activity  Income   
       CMA California Municipal Money Fund  $ (1,899,941)  $ 72 
(d) Represents the current yield as of report date.       

3

BlackRock California Insured Municipal Income Trust (BCK)
Schedule of Investments November 30 2009 (Unaudited)

• Fair Value Measurements - Various inputs are used in determining the fair value of
investments, which are as follows:

• Level 1 - price quotations in active markets/exchanges for identical assets and
liabilities
• Level 2 - other observable inputs (including, but not limited to: quoted prices for
similar assets or liabilities in markets that are active, quoted prices for identical or
similar assets or liabilities in markets that are not active, inputs other than quoted
prices that are observable for the assets or liabilities (such as interest rates, yield
curves, volatilities, prepayments speeds, loss severities, credit risks and default
rates) or other market-corroborated inputs)

• Level 3 - unobservable inputs based on the best information available in the
circumstances, to the extent observable inputs are not available (including the
Trust's own assumptions used in determining the fair value of investments)

The inputs or methodology used for valuing securities are not necessarily an indication
of the risk associated with investing in those securities. For information about the
Trust's policy regarding valuation of investments and other significant accounting
policies, please refer to the Trust's most recent financial statements as contained in
its annual report.

The following table summarizes the inputs used as of November 30, 2009 in
determining the fair valuation of the Trust's investments:

Valuation  Investments in 
Inputs  Securities 
  Assets 
Level 1 - Short-Term Securities  $ 512,901 
Level 2 - Long-Term Investments1  112,400,599 
Level 3  - 
Total  $ 112,913,500 

1See above Schedule of Investments for values in the state.

4

Item 2 – Controls and Procedures

2(a) – The registrant's principal executive and principal financial officers or persons performing
similar functions have concluded that the registrant's disclosure controls and procedures (as
defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the
“1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the
evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act
and Rule 13(a)-15(b) under the Securities Exchange Act of 1934, as amended.

2(b) – There were no changes in the registrant's internal control over financial reporting (as defined
in Rule 30a-3(d) under the 1940 Act) that occurred during the registrant's last fiscal quarter
that have materially affected, or are reasonably likely to materially affect, the registrant's
internal control over financial reporting.

Item 3 – Exhibits

Certifications – Attached hereto

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by
the undersigned, thereunto duly authorized.

BlackRock California Insured Municipal Income Trust

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer of
BlackRock California Insured Municipal Income Trust

Date: January 22, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, this report has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer (principal executive officer) of
BlackRock California Insured Municipal Income Trust

Date: January 22, 2010

By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock California Insured Municipal Income Trust

Date: January 22, 2010