Holiday weekends at SLC fill the Economy Lot; that’s when Overflow Parking Lot appears.
Overflow Parking Lot at Salt Lake City International Airport (SLC) is a seasonal, backup option that airport staff open only when the main Economy and daily lots are near capacity, usually around Thanksgiving, Christmas, spring break, and big event weeks. It sits in additional surface areas near the Terminal complex and is not sold or listed as a separate product on SLC’s main parking page, so you only encounter it when signs or attendants redirect you on arrival.
Because it is episodic, there is no fixed 24/7 "open" schedule published, and pricing is typically aligned with the standard Economy Lot rate shown on the official SLC parking page on the day you park. During peak mornings around 6:00–9:00 a.m., attendants at the Terminal entrance roads may wave you past the regular Economy entrances and into these extra sections, which function as overflow but are not strongly branded on-site.
Reports from Utah travel forums mention that when Economy approaches full, drivers are routed into additional rows beyond the usual Economy pattern, sometimes in areas not clearly marked on older SLC parking maps from before the Terminal rebuild. On the way back, some travelers say they lose 10–20 minutes trying to relocate a car parked in these unfamiliar overflow rows, since the row labels don’t always match what they noted in their phone or on older printed guides.
Regular SLC flyers say that during heavy travel periods like the Wednesday before Thanksgiving or the Friday before Christmas, they add at least 30–45 minutes to their normal airport buffer to avoid getting pushed into Overflow Parking Lot and to grab a slot in the main Economy Lot. If you’re driving in on a peak day, screenshot the current SLC parking map, snap a photo of the nearest pole or sign where you park, and drop a pin in your maps app before you head to the Terminal.