Rosetta Resources 8-K Regulation FD Disclosure

5th Annual Emerging Growth
Institutional Investor Forum
January 22-23, 2008

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Forward Looking Statements

All statements, other than statements of historical fact, included in this presentation are
“forward-looking” statements within the meaning of Section 27A of the Securities Act of
1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended,
including statements regarding the intent, belief or current expectations of Rosetta
Resources Inc. and its subsidiaries (the “Company”) and its management. These
forward-looking statements are based upon current expectations and are subject to a
number of risks, uncertainties and assumptions that could cause actual results to differ
materially from those herein described. Accordingly, you are cautioned that these
forward-looking statements are not guarantees of future performance. Please refer to
Company’s risks, uncertainties and assumptions as it discloses from time to ti
me in the
Company’s reports and registration statements filed with the SEC, including the risk factors
identified in its Annual Report on Form 10-K for the year ended December 31, 2006, which
can also be found on the Company’s website at www.rosettaresources.com.  The
Company undertakes no duty to update the information contained herein except as
required by law.

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Corporate Profile

§Rosetta established as a stand-alone operating
company on July 7, 2005

§Over 500 drilling locations at inception

§Stock Trades on NASDAQ, Symbol: “ROSE”

§Shares Outstanding (Dil)= 50.6 Million

§Track record of performance established

•85% drilling success ratio

•$2.70 organic finding cost in 2006

•240% reserve replacement in 2006

•14% annual growth in reserves (2005-2006)

•26% annual growth in production (2005-2006)

•7 consecutive quarters of production increases

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PROVED RESERVES

408 BCFE *

 * Reserve number excludes 23.4 Bcfe of proved reserves
    associated with the Calpine non-consent properties

Growing Reserve Base
(as of 12/31/06)

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2006 to 2007

36%

92 MMcfe/d

(MMcfe/d)

Production

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(Millions)

2007 Program2

2006 Actual1

Total CapEx = $240

Total CapEx = $318

1.Includes $35.3 for property acquisitions.

2.Includes $38 for OPEX acquisition in California.

Capital Expenditures

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Outstanding Contract/Transition Issues

§Ongoing Rio Vista Gas Sales Contract

§Partial Settlement Complete

•Gas Marketing Agreement Extension

•Title Issues to be Resolved

•California Audit Complete

§Non-Consent Properties ($75 Million)

§Fraudulent Conveyance Resolution

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October 24, 2007	Hearing on Rosetta’s Motion to Dismiss.
November 20, 2007	Court appointed its own valuation consultant.
November 20, 2007	Miller Buckfire disclosed revised valuation.
December 19, 2007	Calpine Plan Confirmed

NEXT STEPS

• Additional Depositions

• Report of Experts

• Witness List Finalized

• Trial

Calpine Transition Timeline

Northern OperationsCalifornia  Rockies

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Sacramento Basin

Rio Vista

§33,843 net acres under lease

§100 % working interest in RVGU and most deep leases

§ 137 producing wells

Sac Extension (including Opex)

§41,194 net acres under lease

§45 - 100% working interest

§36 producing wells

2007 Full Year Highlights and Plans

§Acquired Opex properties for $38.7 MM, effective 10/1/06

§Extended Martinez production on South Twitchell Island by
drilling 5 successful wells

§Drilled development well on Opex Roaring River prospect

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DJ Basin

General Information

§Target zone - Niobrara Chalk at 2,500’

§Approximately 80,000 net acres with average of 80% working
interest

§Typical well - costs $220,000 to drill and complete, 0.2 to 0.4 Bcfe of
reserves and 70 to 150 Mcfe/d initial production

§84 producing wells

Year to Date 2007 Activity

§Drilled 54 wells, 80% successful

§Leased 20,000 net acres

§Completed construction on 13 mile gathering system in South
Republican

§Extended South Republican gathering system to connect Vernon
wells

§Acquired 17 square miles of 3D seismic in SW Wray prospect

Southern OperationsLoboPerdidoSabine Lake

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South Texas - Lobo

General Information

§+/-81,000 acres

§90% - 100% working interest

§Over 280 wells

2007 Activity

§Drilled 44 wells, completing 36 wells

§Acquired +80 square mile 3-D over its LOBO properties

§Added over 10,000 net acres in the LOBO significantly increasing
its drilling inventory in the LOBO play

South Callaghan Ranch &
El Corazon Ranch
(approx. 55,000 acres)

Schwarz-Rottersman
(approx. 21,000 acres)

La Perla (approx.
5,000 acres)

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South Texas - Perdido

General Information

§50% working interest - 37.5% N.R.I.

§EOG is Operator

§+/- 18,000 net acres

§+/- 100 square miles of 3-D seismic

§40 Producing Wells (25 verticals and 15 horizontals)

§>90% Drilling success

2007 Activity

§Drilled 10 wells completing 10 wells

Currently drilling

7/6/07

Perdido Acreage

2007 Upper Perdido locations

2007 Blue Delta Locations

2007 Red Delta Locations

Current horizontal producers

2007 Lower Perdido locations

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State Waters - Texas & Louisiana

Sabine Lake

General Information

§50% working interest - 35.625% N.R.I.

§6,850 acres - 70 square miles of 3-D seismic

Year to date 2007 Activity

§Drilled four wells - 75% success rate

§ST 30 #1 drilled - Hackberry discovery - brought on
production in October

§ST 30 #2 completing - Logged Hackberry pay - brought
on production in November

§ST 19071 #1 - Successful Miocene discovery - brought
on production in December

§ST 16-1 drilled - dry hole

Financials

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September YTD Results

	2007	2006
Average Production (MMcfe/day)	118	89
Realized Price ($/Mcfe)	$7.84	$8.16
Total Revenues ($MM)	$252.4	$199.1
Net Income ($MM)	$39.8	$31.4
EPS Diluted ($/Share)	$0.79	$0.62
Average Shares Outstanding <MM> (Diluted)	50.6	50.4

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Balance Sheet Highlights

(in thousands)	9/30/07	12/31/06
Cash and Cash Equivalents	$14	$63
Total Assets	$1,323	$1,219
Long Term Debt	$250	$240
Stockholder’s Equity	$857	$822
Debt/Total Capital	23%	23%

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§Hedged 65 BBTU/D for 2008 with swaps with an average price of
$7.74.

§Protected 2009 natural gas production with 52 BBTU/D swapped at an
average price of $7.65

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Hedge Update