The best time to buy outdoor furniture is late summer and early fall months for northern US. The outdoor furniture industry starts its year in September.
Major trade shows in North America are in September where retailers order their spring season merchandise. So practically July, August and September are the months where retailers offer discounts on already stocked merchandise of outdoor patio furniture.
On the other hand, Early Spring sales are also visible in February, March and April to get a quick start for the summer. Retailers that need lead times like 4 weeks like to start off early to order. Don't forget to check out our Daily Deal page time to time.