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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: Donald C. Burke, Chief Executive Officer, BlackRock
California Insured Municipal Income Trust, 800 Scudders Mill Road, Plainsboro, NJ, 08536.
Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011

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

Date of fiscal year end: 08/31/2009

Date of reporting period: 05/31/2009

Item 1 – Schedule of Investments

BlackRock California Insured Municipal Income Trust     
Schedule of Investments May 31, 2009 (Unaudited)  (Percentages shown are based on Net Assets) 
      Par   
  Municipal Bonds    (000)  Value 
California - 140.8%         
County/City/Special District/School   Benicia, California, Unified School District, GO, Series B,     
District - 77.2%  5.531%, 8/01/23 (a)(b)    $ 6,500  $ 3,030,690 
  Central Unified School District, California, GO (Election of     
  2008), Series A, 5.625%, 8/01/33 (c)    400  411,992 
  Ceres, California, Unified School District, GO (Election of     
  2001), Series B, 5.906%, 8/01/30 (a)(b)(d)  3,055  898,109 
  Ceres, California, Unified School District, GO (Election of     
  2001), Series B, 5.914%, 8/01/31 (a)(b)(d)  3,180  879,938 
  Ceres, California, Unified School District, GO (Election of     
  2001), Series B, 5.919%, 8/01/32 (a)(b)(d)  3,300  859,254 
  Ceres, California, Unified School District, GO (Election of     
  2001), Series B, 5.923%, 8/01/33 (a)(b)(d)  3,440  840,495 
  Ceres, California, Unified School District, GO (Election of     
  2001), Series B, 5.892%, 8/01/34 (a)(b)(d)  3,575  830,472 
  Ceres, California, Unified School District, GO (Election of     
  2001), Series B, 5.896%, 8/01/35 (a)(b)(d)  3,275  716,897 
  Evergreen, California, Elementary School District, GO (Election     
  of 2006), Series B, 5.125%, 8/01/33 (c)    5,000  5,009,450 
  Fontana Unified School District, California, GO (Election of     
  2006), Series B, 5.25%, 8/01/26 (e)    5,400  5,668,110 
  Glendale, California, Community College District, GO (Election     
  of 2002), Series D, 5%, 11/01/31 (a)    2,500  2,473,300 
  Hemet, California, Unified School District, GO, Series B,     
  5.125%, 8/01/37 (c)    2,140  2,113,122 
  Kern County, California, COP (Capital Improvements Projects),     
  Series A, 6%, 8/01/35 (c)    1,500  1,569,285 
  Long Beach, California, Unified School District, GO (Election of     
  2008), Series A, 5.75%, 8/01/33    1,000  1,059,730 
  Los Angeles, California, Community College District, GO     
  (Election of 2001), Series A, 5%, 8/01/32 (d)(e)  3,000  2,975,400 
  Los Angeles, California, Community College District, GO,     
  Refunding (Election of 2008), Series A, 6%, 8/01/33  3,825  4,116,350 
  Los Angeles, California, Unified School District, GO, Series D,     
  5%, 7/01/26    600  611,886 
  Morongo, California, Unified School District, GO (Election of     
  2005), Series A, 5.25%, 8/01/38 (c)    1,775  1,780,130 
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 list below.

COP  Certificates of Participation 
GO  General Obligation Bonds 
VRDN  Variable Rate Demand Notes 

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BlackRock California Insured Municipal Income Trust     
Schedule of Investments May 31, 2009 (Unaudited)  (Percentages shown are based on Net Assets) 
       Par   
  Municipal Bonds    (000)  Value 
  Murrieta Valley, California, Unified School District, Public     
  Financing Authority, Special Tax Revenue Bonds, Series A,     
  5.125%, 9/01/26 (c)    $ 1,000  $ 1,005,640 
  Riverside, California, Unified School District, GO (Election of     
  2001), Series A, 5%, 2/01/27 (a)(d)    5,000  5,004,650 
                                            San Diego, California, Community College District, GO
  (Election of 2002), 5.25%, 8/01/33    2,000  2,042,540 
  San Jose, California, Financing Authority, Lease Revenue     
  Refunding Bonds (Civic Center Project), Series B,     
  5%, 6/01/37 (f)    6,000  5,815,440 
  San Leandro, California, Unified School District, GO (Election     
  of 2006), Series B, 6.25%, 8/01/29 (e)    1,125  1,232,899 
  Stockton, California, Unified School District, GO (Election of     
  2005), 5%, 8/01/31 (e)    3,000  2,991,810 
  Westminster, California, Redevelopment Agency, Westminster     
  Commercial Redevelopment Project Number 1, Subordinate     
  Tax Allocation Bonds (Police Facility), 6.25%, 11/01/39 (c)  1,000  1,053,160 
        54,990,749 
Education - 14.3%  Alameda County, California, Joint Powers Authority, Lease     
  Revenue Refunding Bonds, 5%, 12/01/34 (e)  1,200  1,153,200 
  California Educational Facilities Authority Revenue Bonds     
  (Scripps College), 5%, 8/01/31 (a)    2,385  2,591,613 
  Pittsburg, California, GO (Election of 2006), Series B, 5.50%,     
  8/01/34 (e)    2,000  2,040,240 
  Snowline, California, Joint Unified School District, COP (2009     
  Refinancing Program), 5.75%, 9/01/38 (c)  2,000  2,030,760 
  University of California Revenue Bonds, Series O, 5.75%,     
  5/15/34    2,200  2,365,704 
        10,181,517 
State - 11.4%  California State, GO, 6.50%, 4/01/33    3,875  4,212,125 
  California State University, Systemwide Revenue Refunding     
  Bonds, Series A, 5%, 11/01/30 (f)    4,000  3,942,960 
        8,155,085 
Transportation - 5.3%  San Joaquin Hills, California, Transportation Corridor Agency,     
  Toll Road Revenue Refunding Bonds, Series A,     
  5.49%, 1/15/31 (a)(b)    20,000  3,759,800 
Utilities - 32.6%  California State Department of Water Resources, Water     
  System Revenue Refunding Bonds (Central Valley Project),     
  Series AE, 5%, 12/01/28    2,500  2,623,800 
  East Bay Municipal Utility District, California, Water System     
  Revenue Bonds, Sub-Series A, 5%, 6/01/35 (a)  3,000  3,000,000 
  East Bay Municipal Utility District, California, Water System     
  Revenue Refunding Bonds, Series A, 5%, 6/01/37 (a)(d)  4,000  3,970,200 
                                            Los Angeles, California, Wastewater System Revenue
  Refunding Bonds, Series A, 5%, 6/01/32 (a)(d)  4,000  3,951,520 

2

BlackRock California Insured Municipal Income Trust     
Schedule of Investments May 31, 2009 (Unaudited)  (Percentages shown are based on Net Assets) 
               Par   
  Municipal Bonds         (000)     Value 
Los Angeles, California, Wastewater System Revenue
  Refunding Bonds, Sub-Series A, 5%, 6/01/27 (a)  $ 5,000  $ 5,037,850 
Metropolitan Water District of Southern California,
  Waterworks Revenue Bonds, Series B-2, 5%, 10/01/27 (a)(d)  1,750  1,788,185 
  Napa, California, Water Revenue Bonds, 5%, 5/01/35 (f)  3,000  2,886,090 
        23,257,645 
  Total Municipal Bonds - 140.8%      100,344,796 
  Municipal Bonds Transferred to Tender     
  Option Bond Trusts (g)       
California - 13.4%         
Utilities - 13.4%  San Diego County, California, Water Authority, Water Revenue     
  Refunding Bonds, COP, Series A, 5%, 5/01/32 (a)  5,292  5,297,245 
  San Diego County, California, Water Authority, Water Revenue     
  Refunding Bonds, COP, Series A, 5%, 5/01/33 (e)  4,250  4,208,860 
  Total Municipal Bonds Transferred to       
  Tender Option Bond Trusts - 13.4%      9,506,105 
  Total Long-Term Investments       
  (Cost - $111,372,586) - 154.2%      109,850,901 
  Short-Term Securities       
California - 4.2%  Los Angeles County, California, Metropolitan Transportation     
  Authority, Sales Tax Revenue Refunding Bonds, Proposition     
  C, VRDN, Second Senior Series A, 5.75%, 6/08/09 (a)(h)  3,000  3,000,000 
      Shares   
Money Market Fund - 2.4%  CMA California Municipal Money Fund, 0.07% (i)(j)  1,711,916  1,711,916 
  Total Short-Term Securities (Cost - $4,711,916) - 6.6%    4,711,916 
  Total Investments (Cost - $116,084,502*) - 160.8%    114,562,817 
  Liabilities in Excess of Other Assets- (1.4)%    (985,883) 
                                                       Liability for Trust Certificates, Including Interest
  Expense and Fees Payable - (6.7)%      (4,774,929) 
  Preferred Shares, at Redemption Value - (52.7)%    (37,553,574) 
  Net Assets Applicable to Common Shares - 100.0%  $ 71,248,431 

* The cost and unrealized appreciation (depreciation) of investments as of May 31, 2009, as computed for federal income
tax purposes, were as follows:

Aggregate cost  $ 111,364,775 
Unrealized appreciation  1,628,717 
Unrealized depreciation  (3,202,524) 
Net unrealized depreciation  $ (1,573,807) 

(a) NPFGC Insured.

(b) Represents a zero-coupon bond. Rate shown reflects the current yield as of report date.

(c) Assured Guaranty Insured.

(d) FGIC Insured.

(e) FSA Insured.

(f) AMBAC Insured.

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BlackRock California Insured Municipal Income Trust
Schedule of Investments May 31, 2009 (Unaudited)

(g) 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.

(h) Security may have a maturity of more than one year at the time of issuance but has variable rate and demand features
that qualify it as a short-term security. Rate shown is as of report date and maturity shown is the date the principal
owed can be recovered through demand.

(i) 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  (4,560,951)  $ 36,477 

(j) Represents the current yield as of report date.

• Effective September 1, 2008, the Trust adopted Financial Accounting Standards Board Statement of Financial Accounting
Standards No. 157, "Fair Value Measurements" ("FAS 157"). FAS 157 clarifies the definition of fair value, establishes a
framework for measuring fair values and requires additional disclosures about the use of 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 securities

• 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, prepayment 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 semi-
annual report.

The following table summarizes the inputs used as of May 31, 2009 in determining the fair valuation of the Trust's
investments:

Valuation  Investments in 
Inputs  Securities 
  Assets 
Level 1  $ 1,711,916 
Level 2  112,850,901 
Level 3  - 
Total  $ 114,562,817 

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/ Donald C. Burke
Donald C. Burke
Chief Executive Officer of
BlackRock California Insured Municipal Income Trust

Date: July 15, 2009

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/ Donald C. Burke
Donald C. Burke
Chief Executive Officer (principal executive officer) of
BlackRock California Insured Municipal Income Trust

Date: July 15, 2009

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

Date: July 15, 2009