The New York-based Conference Board said Tuesday that its Consumer Confidence Index rose more than 12 points to 39.2, up from a revised 26.9 in March. The reading marks the highest level since November's 44.7 and well surpasses economists' expectations for 29.5.
Some encouraging news in areas like retail sales and housing have helped fuel a recent stock rally. Earlier Tuesday, a housing index showed that home prices dropped sharply in February, but for the first time in 25 months the decline was not a record - another sign the housing crisis could be bottoming.
Economists closely monitor consumer sentiment because consumer spending accounts for more than two-thirds of economic activity.
"This is just a small step. We're starting to move in the right direction and if this continued [it] could signal some growth or improvement in the economy come the second half of this year," Lynn Franco, director of the Conference Board's Consumer Research Center, told CBS News.
The huge jump in confidence follows a small increase in March, following a freefall in February. Still, the index remains well below year-ago levels of 62.8.
The April gains were fueled by "a significant improvement in the short-term outlook," Franco said in a statement.
She added that the index measuring how shoppers feel now, which posted a moderate gain, offered "a sign that conditions have not deteriorated further and may even moderately improve in the second quarter."
The Present Situation rose slightly to 23.7 from 21.9 last month. The Expectations Index, which measures how shoppers feel about the economy over the next six months, skyrocketed to 49.5 from 30.2 in March.
That sharp increase suggests that people believe the economy is nearing a bottom, Franco said - but noted that the index remains well below the level associated with strong economic growth.
The economy still faces big challenges. With companies continuing to lay off workers, a major fear is that people will cut back their spending even more, and that could plunge the economy further into a downward spiral. Economists expect the unemployment rate - now at 8.5 percent and the highest since late 1983 - will hit 10 percent by the end of the year and keep climbing next year before it starts coming down.
Meanwhile, investors are becoming more unsettled by the possibility of a major swine flu outbreak, which could stall economic recovery - particularly in regions that depend on travel and tourism. Adam York, an economist at Wachovia Securities, said such a development could dampen confidence levels for May, but it's still early to tell.
The cutoff date for the preliminary confidence results was April 21, before concerns about swine flu became widespread.