By Angela Chen 

Costco Wholesale Corp. on Thursday reported a better-than-expected 29% rise in earnings in the February quarter, boosted by a tax benefit and lower fuel prices.

Shares of Costco, up 26% over the past year, rose 2.3% to $150.56 in premarket trading as the wholesale giant's second-quarter profit soundly beat analysts' expectations.

Costco, the second-largest retailer in the U.S. behind Wal-Mart Stores Inc., has been a standout of late in the sector and is one of the largest fuel retailers in the U.S.

The recent sharp decline in fuel costs was thought to help Costco's results because the prices that the retailer pays for gas were seen falling faster than the prices the retailer was charging consumers at the pump. Analysts, however, have said this is likely a short-term phenomenon until market resets itself.

Meanwhile, cheaper gas prices at the pump also leave consumers with more disposable income to spend at its stores.

Earlier this week, the company said Citigroup Inc. and Visa Inc. won the sought-after contract for its credit-card business, replacing American Express Co., in a move that will significantly expand the kind of plastic that is accepted at the warehouse giant. Starting April 1, 2016, Visa will be the only brand accepted at Costco. In addition, Costco will partner with Citi to issue a new co-branded card to replace an existing Amex-Costco card.

The company, which started in 1983 in Seattle, now has 671 locations around the world and a customer base that is loyal and affluent: Costco customer households in the U.S. had an average income of $91,862 in January, compared with an average U.S. household income of $68,664, the firm said. More than 90% of its customers renewed last year.

Costco said sales excluding newly opened and closed stores rose 2% in its second quarter. In the U.S., that metric increased 4%.

In all, the company's quarterly profit rose to $598 million, or $1.35 a share, from $463 million, or $1.05 a share, a year ago.

Costco said earnings were help by a tax benefit of $57 million, or 13 cents a share, related to the company's special cash dividend of $5 in February and hurt by costs of $14 million, or 3 cents a share, because of a continuing tax matter.

Revenue rose 4.4% to $27.45 billion. Costco's revenue from membership fees increased 5.8% to $582 million. Merchandise costs gained 3.7% to $23.9 billion.

Analysts had expected a profit of $1.18 a share and revenue of $27.65 billion, according to Thomson Reuters.

"Costco delivered one of its strongest quarters in recent memory," Sterne Agee analyst Charles Grom said, adding that the company's per-share earnings beat analyst expectation by the largest amount in at least 13 years.

For the four weeks ended March 1, Costco reported sales of $8.18 billion, up 4% from a year ago. Sales excluding newly opened and closed stores rose 1% world-wide in February and 2% in the U.S.

Mr. Grom said the company's February sales growth--which was 8% world-wide excluding gas price deflation and foreign exchange--also surpassed his expectations.

Write to Angela Chen at angela.chen@wsj.com

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