EXHIBIT 5.1

Michael L. Platt

T: +1 720 566 4012

mplatt@cooley.com

April 2, 2013

Rally Software Development Corp.

3333 Walnut Street

Boulder, CO  80301

Ladies and Gentlemen:

You have requested our opinion with respect to certain matters in connection with the filing by Rally Software Development Corp., a Delaware corporation (the “Company”), of a Registration Statement (No. 333-187173) on Form S-1 (the “Registration Statement”) with the Securities and Exchange Commission, including a related prospectus filed with the Registration Statement (the “Prospectus”), covering an underwritten public offering of up to six million six hundred twelve thousand five hundred (6,612,500) shares of the Company’s common stock, par value $0.0001 (the “Shares”), including eight hundred sixty two thousand five hundred (862,500) shares for which the underwriters have been granted an over-allotment option.

In connection with this opinion, we have (i) examined and relied upon (a) the Registration Statement and the Prospectus, (b) the Company’s Amended and Restated Certificate of Incorporation and Amended and Restated Bylaws, as currently in effect, (c) the Company’s Amended and Restated Certificate of Incorporation, filed as Exhibit 3.3 to the Registration Statement, and the Company’s Amended and Restated Bylaws, filed as Exhibit 3.5 to the Registration Statement, each of which is to be in effect upon the closing of the offering contemplated by the Registration Statement, and (d) the originals or copies certified to our satisfaction of such records, documents, certificates, memoranda and other instruments as in our judgment are necessary or appropriate to enable us to render the opinion expressed below, and (ii) assumed that the Shares to be sold to the underwriters by the Company will be sold at a price established by the Board of Directors of the Company or the Pricing Committee thereof in accordance with Section 153 of the Delaware General Corporation Law. We have undertaken no independent verification with respect to such matters. We have assumed the genuineness and authenticity of all documents submitted to us as originals, and the conformity to originals of all documents submitted to us as copies and the due execution and delivery of all documents where due execution and delivery are a prerequisite to the effectiveness thereof.  As to certain factual matters, we have relied upon a certificate of an officer of the Company and have not sought independently to verify such matters. Our opinion is expressed only with respect to the General Corporation Law of the State of Delaware. We express no opinion as to whether the laws of any particular jurisdiction are applicable to the subject matter hereof.  We are not rendering any opinion as to compliance with any federal or state antifraud law, rule or regulation relating to securities, or to the sale or issuance thereof.

On the basis of the foregoing, and in reliance thereon, we are of the opinion that the Shares, when sold and issued against payment therefor as described in the Registration Statement and the Prospectus, will be validly issued, fully paid and non-assessable.

380 INTERLOCKEN CRESCENT, SUITE 900, BROOMFIELD, CO 80021-8023  T: (720) 566-4000  F: (720) 566-4099  WWW.COOLEY.COM

Rally Software Development Corp.

Page 2

We consent to the reference to our firm under the caption “Legal Matters” in the Prospectus included in the Registration Statement and to the filing of this opinion as an exhibit to the Registration Statement.

Sincerely,

Cooley LLP