Whether you can use outdoor furniture on grass depends largely on the furniture type and your stability expectations. Generally, a solid, flat surface like a patio, deck, or concrete slab is recommended for optimal stability, safety, and to prevent premature wear or damage. Grass surfaces are often uneven and soft, which can cause furniture legs to sink, wobble, or tip over, creating a safety hazard. It can also lead to moisture damage and rust on metal frames or cause wooden legs to rot.
For occasional use on grass, heavier furniture with wide, flat legs (like some picnic tables) may be acceptable. For lighter chairs and tables, using protective foot caps or patio furniture mats/scaffold boards can help distribute weight and improve stability. Always check the manufacturer's guidelines. For permanent or frequent use, creating a level base with pavers, gravel, or a dedicated patio area is the best solution for longevity and safety.