KIRKLAND, Wash. — In California, nearly 50,000 fans swarmed the first nine days of the Dallas Cowboys’ training camp. Former Cowboys running back Julius Jones, now a Seahawk, said that camp is a “circus.”

In Green Bay, thousands of Packer Backers watch their team’s every summer move. And it was that way before Brett Favre decided to un-retire.

In Seattle? More trees watch Seahawks training camp than people. Way more.

The Seahawks are in a closed camp at their old, cramped team headquarters for the second consecutive summer. No fans are allowed to watch as they transition from their longtime open camp at rural Eastern Washington University across the state into their glitzy new facility in suburban Renton, Wash., later this month.

“You know, I don’t think the coaches like it,” Pro Bowl quarterback Matt Hasselbeck said of Seattle’s summer silence. “It’s different. We’re in a different environment here. You know, there aren’t a lot of fans here. This is not a real media circus like it is in some other camps right now. It’s just different. It’s quiet here.”

As Jones puts it, “Here, you get to know your teammates really well.”

That’s because there’s no one else to meet.

Aside from a dozen or so media members and another handful of team staffers or an occasional VIP group hosted by team marketers, the defending four-time NFC West champions practice alone. It’s as if they were a Class B team getting ready for the high school season.

The Seahawks are keeping their camp closed because their 22-year-old Kirkland facility, wedged on a hillside between Northwest University’s campus and a residential neighborhood, is too small and does not have enough parking to host fans.

Hasselbeck was Favre’s backup in Green Bay a decade ago. So he knows what that camp is like — and how crazy it’s about to get now that the commissioner has reinstated Favre from retirement.

“I can imagine,” Hasselbeck said. “But, it’s nice here. It’s peaceful, you know? It’s good.”

So different, when the Seahawks got their lone summer interaction with fans this weekend, attention-starved players reacted like it was a January playoff game. About 10,000 people came to Saturday’s annual scrimmage at Qwest Field, Seattle’s only public practice of the summer.

Walter Jones, Lofa Tatupu, Nate Burleson — who didn’t play in a scrimmage full of reserves — joined many teammates for a victory-like lap around the field to sign autographs and pose for pictures for fans who were lined up six deep along the first rows of seats.

A 30-something woman wearing a replica of Tatupu’s blue, No. 51 game jersey held up a sign that read in brightly colored letters: “Marry Me, Lofa.”

“Yeah, I saw it,” the 25-year-old Pro Bowl linebacker said, chuckling.

Even during the scrimmage, players basked in the attention. Rookies marveled at how loud 10,000 people sounded. Fans were loudest at the midway point of the practice when coach Mike Holmgren exhorted the crowd over the public-address system to scream like it was last January’s playoff win over Washington.

Tight end John Carlson, whose college career at Notre Dame wasn’t exactly played in obscurity, said given Saturday’s ruckus he can’t imagine how loud a regular season home game will be. Running back Justin Forsett, the star of the scrimmage after a 33-yard cutback run dazzled the fans and improved his odds of making the team, loved the break from camp silence.

“Definitely. You see the same thing every day in practice. This is first time in the stadium. It was great,” said Forsett, a seventh-round draft choice from California. “I could get use to this.”

Camp silence has apparently been disorienting. Undrafted rookie Jamar Adams, a safety, played his college games in front of more than 100,000 people at Michigan — and said Saturday in a stadium one-sixth full was a louder, better football atmosphere.

“It was absolutely fantastic,” Adams said.

What? Better than an Ohio State-Michigan game inside “The Big House” in Ann Arbor?

“Now that’s different,” Adams said. “That’s on another level right there.

“I’m talking about a regular game.”

Notes:@ Saturday’s scrimmage took a toll on Sunday’s practices. Almost two dozen players were out in the afternoon. None of the new injuries are to starters, since most didn’t participate in the scrimmage. The most serious injury was to CB DeMichael Dizer, a roster long-shot who was placed on injured reserve and is out for the season while facing surgery for a torn knee ligament. Jordan Babineaux, the nickel defensive back for passing downs, “tweaked his knee a little bit,” according to Holmgren, and is getting an MRI. Rising WR prospect Logan Payne was out with cracked ribs. OL Floyd Womack, who played LT for Walter Jones Saturday, also “tweaked” his knee and is getting tests, Holmgren said. “Can’t scale back on Walter that much then, because we’re running out of people over there,” Holmgren said. ... The team signed G-C Ben Claxton to fill Dizer’s roster spot.