Lots of holiday shoppers hit the stores, such as Toys R Us in New York's Times Square, on Thanksgiving night.
ShopperTrak, which measures and analyzes foot traffic at more than 50,000 retail locations nationwide, says Black Friday store visits climbed 3.5% from last year to more than 307.67 million.
But Black Friday retail sales fell 1.8% to $11.2 billion, the firm said.
"While foot traffic did increase on Friday, those Thursday deals attracted some of the spending that's usually meant for Friday," said Bill Martin, ShopperTrak's founder, in a statement.
ShopperTrak said foot traffic rose in most of the nation except for the West, where it was down more than 11%.
"Black Friday shopping continues to expand into Thanksgiving Day and will impact the way we look at all of the 'Black' weekend results, since more shopping hours allows for more shopping visits and a smoothing of sales across all of the days," said Martin.
"By opening even earlier, the retailers have been able to attract a broader spectrum of consumers to participate in Black Friday -- not everyone is willing to wake up at 4 a.m.," said Marshal Cohen, chief industry analyst at the NPD Group. "They definitely got a lot more business early and upfront."
Shoppers started lining up at the Sears at North Point Mall in Alpharetta, Ga., around 6:30 p.m. on Thursday, and by the time the retailer opened, there was a crowd of about 500 people, said Nick Nicolosi, the mall's general manager. When the clock struck midnight and other stores opened, Nicolosi estimated that about 5,000 people were waiting to storm the stores -- the biggest Black Friday crowd North Point has seen since it began hosting its Rockin Shoppin Eve event five years ago.
La Plaza Mall in McAllen, Texas, had to use its off-duty police officers and security to control traffic outside of stores.
"Many stores including Abercrombie & Fitch ( had to close their store entrances temporarily as they had reached capacity with hundreds of shoppers waiting to enter the stores," said Isabel Rodriguez-Vera, area director of marketing. )
Not everyone was willing to wait in line. Online sales soared over the two-day shopping period, climbing more than 17% from last year on Thanksgiving and nearly 21% on Black Friday, according to IBM Benchmark. Sales made from mobile devices grew by nearly two-thirds over 2011.
"We've absolutely seen this whole weekend turn into one big promotional event," said Jay Henderson, strategy director for IBM Smarter Commerce. "Black Friday deals are no longer just for the [brick-and-mortar] store, and Cyber Monday deals are no longer just for Monday."
However, the initial surge is likely to be temporary. By Sunday morning, Cohen expects shopper traffic to fall back to normal pre-holiday sales levels. "There are more hours to shop, but consumers don't have more relatives or more money in their pocket, so once all the dust settles, we won't see too much growth overall," he said.
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