Alerts were triggered in Safed as a result of dozens of rockets fired towards the city.
The Israel Air Force intercepted some of the rockets, while others fell in open areas, the military said.
New moves could signal a strategy to return focus to Hezbollah's longer-range rockets.
As a result of the sirens, departures and arrivals at Ben-Gurion Airport have been temporarily suspended.
The IDF said alerts had sounded in central Israel due to rocket fire from the Gaza Strip.
On Friday evening, nearly 200 rockets were seen crossing from Lebanon into Israeli territory as of 8 p.m.
Approximately 250 terrorists have been killed from the ground and air in Lebanon, and over 2,000 Hezbollah military targets have been attacked.
The IDF said the alerts had been triggered due to projectiles that had been fired at Israel from Lebanon, with some of them being intercepted.
UK government announces £5 million in support of humanitarian efforts in Lebanon • IDF detects suspicious movement on Lebanese border
Hezbollah’s rockets reach Tel Aviv and Eilat as Israel ramps up strikes on Lebanon, preparing for a potential ground invasion amid rising casualties.