Egg sticker shock at the grocery store could soon get even worse, one analyst warns.

Squeezed by limited supply because of the worst avian flu outbreak in three decades, egg prices have already risen sharply this year. But BB&T Capital Markets analyst Brett Hundley said retail prices could surge even higher. An uptick to more than $6 for a dozen "would not surprise" him if bird flu returns later this year, something he predicts will occur as early as fall. As of Friday, prices to consumers for New York large shell eggs stood at a range of $1.99 to $4.49 per dozen, USDA data showed.

"It's almost scary to think about what could happen to egg prices," Hundley said.

Catherine MacBride | Moment | Getty Images

Meanwhile, Midwest wholesale prices have risen 135 percent to $2.80 per dozen on Monday, up from $1.19 per dozen on April 22, according to prices from market research firm Urner Barry. Retail prices typically run even higher.

"It's really a day-to-day market," said Brian Moscogiuri, market reporter for eggs and egg prices at Urner Barry, in a phone interview. "It's been very volatile and unpredictable, for sure." Read MoreCNBC Explains: What is bird flu? While the Midwest has borne the brunt of avian flu's impact, BB&T expects bird flu to hit its next target, the Southeast, this fall. Last detected in mid-June, the flu could crop up again by October or November as wild birds carrying the disease migrate to the area. "We think that turkeys and egg layers are most at risk," Hundley said. "We think broilers are at risk but considerably less so."