Rosetta Resources 8-K Regulation FD Disclosure

EXHIBIT 99.1

 Howard Weil Conference

March25, 2010

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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 the Private Securities Litigation Reform
Act of 1995. These statements are based upon current expectations and are subject to a
number of risks, uncertainties and assumptions, which are more fully described in
Rosetta Resources Inc.'s Annual Report on Form 10-K and Quarterly Reports on Form
10-Q filed with the Securities and Exchange Commission. These risks, uncertainties and
assumptions could cause actual results to differ materially from those described in the
forward-looking statements. Rosetta assumes no obligation and expressly disclaims any
duty to update the information contained herein except as required by law.

Cautionary Statement Concerning Resources

The United States Securities and Exchange Commission permits oil and gas companies,
in their filings with the SEC, to disclose only proved, probable and possible reserves that
a company anticipates as of a given date to be economically and legally producible by
application of development projects to known accumulations. We may use certain terms
in this presentation, such as “Risked Project Inventory,” “Potential Projects,” “Risked
Resource Inventory”, “Total Resource Potential”, and “Unrisked Potential” that the SEC's
guidelines strictly prohibit us from including in filings with the SEC. These estimates are
by their nature more speculative than estimates of proved reserves and accordingly are
subject to substantially greater risk of actually being realized.

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Company Overview

Selective Asset Overview

Stacked Pay in Sacramento Basin

Lobo Trend in South Texas

Niobrara Chalk in DJ Basin

Eagle Ford Shale in South Texas

Bakken Shale in Alberta Basin

2010 Expectations

Rosetta Resources
Agenda for this morning’s discussion…

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Rosetta Resources
Company Overview

Rosetta Resources Inc. (NASDAQ: ROSE) was formed in June 2005 to acquire the domestic oil
and natural gas business formerly owned by Calpine Corporation

Headquartered in Houston, Texas

Technical and field offices in Denver, CO, Laredo, TX and Rio Vista, CA

We have grown by developing and exploring unconventional resources in the Lower 48

Our primary focus areas for exploitationare the Sacramento Basin, the Rocky Mountains and South Texas

One of our key plays for exploitation is the Eagle Ford Shale in South Texas

One of our key plays for exploration is the Bakken Shale in the Alberta Basin of Montana

Today, Rosetta has a high quality, diversified proved asset base

Proved reserves of 351 Bcfe as of 12/31/2009¹

75% proved developed; 85% gas

2009 production of 138 MMcfe/d

2009 F&D cost of $2.22/Mcfe

695,000 net acres (900,000 gross); including approximately 254,000 net acres under exploration option in Alberta
Bakken

Over 2,480 net identified drilling opportunities

We have significant potential from low geological risk resource positions

Total resource potential of 899 Bcfe²

Over 60,000 net acres in Eagle Ford Trend of South Texas

Inception to date, we have drilled 9 horizontal wells and currently have 2 rigs running.

Over 250,000 net acres in Alberta Basin

Inception to date we have drilled 3 delineation wells confirming oil present in Lodgepole, Bakken, Three Forks, and Nisku

¹Estimated proved reserves of 412 Bcfe under prior SEC rules

²Total resource potential includes net risked Probable and Possible reserves and 86 Bcfe of PUD’s

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Rosetta has substantial operating control of its reserve base

87% of proved reserves are operated by Rosetta

High working interest in properties

Approximately 40% of acreage is currently held by production

Prudent and conservative financial management

Since 2007, debt to book cap < 40% and debt to LTM EBITDAX< 1.75x

Maintained > $200mm in liquidity since 2008

Hedge to protect downside, capital budget activities and key strategic initiatives

Modest non-core asset sale program to generate cash flow

¹Estimated proved reserves of 412 Bcfe under prior SEC rules

²Total resource potential includes net risked Probable and Possible reserves and 86 Bcfe of PUD’s

Rosetta Resources
Company Overview

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Asset Summary
Proved Reserves	351 Bcfe
% Proved Developed	75%
% Gas	85%
Proved PV -10	$465MM
Net Annual Production	51 Bcfe
Net Acreage*	667,757
Total Resources¹	899 Bcfe
Net drilling locations	2,480

¹Total resource potential includes net risked Probable and Possible reserves and 86 Bcfe of PUD’s

* Includes 230,000 net acres under exploration option at 12/31/2009

Pinedale

San Juan Basin

South Texas

Texas State Waters

Gulf of Mexico

Sacramento Basin

DJ Basin

Alberta Basin

Eagle Ford

Legacy asset

New play entry

Non-core asset

Headquarters

Rosetta Resources
Asset Overview (as of 12/31/09)

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Average Daily Production

Acreage Position

Risked Resource Inventory¹

125

147

139

400,049

615,396

667,757

299

899

Bcfe

¹Total resource potential includes net risked Probable and Possible reserves and 86 Bcfe of PUD’s

Total Debt

($mm)

Rosetta Resources
Historical Performance

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Discovered in 1936

One of California’s most prolific natural gas
fields

16 known producing horizons in the basin

3.7 Tcfe produced to date

Rio Vista Field is the largest onshore natural
gas field in California

Rio Vista Field is one of the 15 largest natural
gas fields in the United States

Region has established natural gas gathering
and pipeline infrastructure

Depth Range

2,500 - 13,000’

Asset Overview
Sacramento Basin:General Description

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2009 recomplete

2010 recomplete

Recompletion Program

By Year

By Recovery

Asset Overview
Sacramento Basin:Recompletion Program

Rio Vista, California

Recompletion Program - Year End 2009

Date

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Rosetta acreage

We have approximately 90,000 net acres
in the South Texas Lobo Trend

255 operated producing wells and 470
square miles of 3-D seismic data

Currently re-mapping SCR using new 3-D
data received in-house late in 12/09

Majority of acreage is 100% owned and
operated; working interest ranges from
50% to 100%

In 2009 we drilled 21 successful wells in
the Lobo Trend

For the year ended 12/31/09, average
net daily production was 44.1 MMcfe/d

Asset Overview
South Texas:Lobo Trend

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We have approximately 100,000 net
acres

154 square miles of 3-D seismic data

In the low commodity prices during
2009, we chose not to drill and focused
our efforts on resource assessment

Commenced a 105-well drilling program
in the first quarter of 2010

Asset Overview
DJ Basin:Niobrara Chalk Play

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12/31/2006

12/31/2007

12/31/2008

1/01/2006

12/31/2009

Dec. 2009: 11.3 MMcf/d

Well count:173

Asset Overview
DJ Basin:Niobrara Chalk Production Growth

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Asset Overview
South Texas:Eagle Ford Shale Play

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Initial Rosetta Wells

Industry Activity

We have accumulated approximately 67,000
gross and 61,000 net acres since 2008

Average working interest of 90-100%

At year-end 2009, we had drilled and
completed 2 horizontal wells

For the quarter ended 12/31/09 our average
net daily production was 4.3 MMcfe/d

Currently, we have drilled 9 horizontal wells

Currently, we have 2 drilling rigs running

Asset Overview
South Texas:Eagle Ford Shale Play

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Initial Rosetta Wells

Industry Activity

Gates Ranch Area

Asset Overview
South Texas:Eagle Ford Shale Play

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Gates Ranch Area¹

Arial extent

9 miles N/S & 9 miles E/W

29,500 net acres

Rosetta Resources operated

100% WI

75% NRI

Unrisked original resource in place

11.3 Tcfe @ 245 Bcfe per section

Unrisked EUR potential

160 acre development

185 net well locations

555 net Bcfe @ 4 Bcfe gross EUR

5% recovery of gas-in-place

80 acre development

369 net well locations

1.1net Tcfe @ 4 Bcfe gross EUR

10% recovery of gas-in-place

¹ Includes a 3,600 net acre lease 8 miles to the North

Water Well

Proposed Well

Drilled Well

Drilling Well

Asset Overview
South Texas:Eagle Ford Shale Play

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Asset Overview
Alberta Basin:Bakken Play

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Today

Asset Overview
Alberta Basin Bakken:North America Today

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Devonian (350 Ma)

Asset Overview
Alberta Basin Bakken:North America 350 million years ago

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Devonian (350 Ma)

Williston Basin

Antrim Shale

Marcellus Shale

New Albany Shale

Asset Overview
Alberta Basin Bakken:North America 350 million years ago

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Devonian (350 Ma)

Alberta Basin

Williston Basin

Antrim Shale

Marcellus Shale

New Albany Shale

Asset Overview
Alberta Basin Bakken:North America 350 million years ago

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Devonian (350
Ma)

Alberta Basin

Asset Overview
Alberta Basin Bakken:North America 350 million years ago

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Today

Asset Overview
Alberta Basin Bakken:North America Today

Alberta Basin

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Alberta Basin Bakken specifics

The Bakken is a Devonian Shale oil play located in northwestern
Montana

Williston Basin analog

Depths ranging from 4,500’ to 7,500’ TVD

Over-pressured reservoirs

Rosetta’s current Bakken position:

254,000 undeveloped net acres

13 - 15 MMBoe per square mile of resource in place

Rosetta’s assessment to date:

Drilled 3 exploratory delineation wells

2 wells on strike 28 miles apart

1 well 8 miles downdip

Confirmed significant oil hydrocarbons in place

Banff (Lodgepole)

Bakken

Three Forks

Nisku

Planned continual resource assessment in 2010

Asset Overview
Alberta Basin Bakken:North America Today

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Rosetta Resources
2010:What to expect …

Disciplined Capital Spending

Live within cash and cash flows

$280 million capital program

High return / high value programs receive majority of funding

Production Growth

Annual production rate of 145 to 155 MMcfe/d

Reserve Growth

Double digit reserve replacement rate

Inventory Growth

Continued resource assessment of all core assets

Continue to develop the Eagle Ford

Continue to delineate and assess the Alberta Bakken

Continue to identify and capture new assets with future development