Exhibit 23.2(a)

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to incorporation by reference in this Registration Statement on Form S-1 for United States Commodity Index Funds Trust of our report dated March 26, 2014 relating to the statement of financial condition for the years ended December 31, 2013 and 2012 of United States Commodity Funds LLC and Subsidiaries included in the Current Report on Form 8-K filed on behalf of United States Commodity Index Funds Trust and to the reference to our Firm as “Experts” in the Prospectus.

/s/ SPICER JEFFRIES LLP

Greenwood Village, Colorado

April 3, 2014