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Last updated on October 2, 2026
How often should you change cat litter? There isn’t one replacement schedule that works for every cat litter. Scoop as needed and follow the replacement directions on your litter’s packaging. Change it sooner if odor remains after scooping, the litter stops performing properly, or the box becomes soiled.
Different litters are simply too different for one calendar. Clumping clay, tofu, silica, walnut, corn and non-clumping litters can all have very different directions, and the number of cats, box size and scooping routine change things too. This guide covers the signs that mean it’s time for a change, and what helps keep the box cleaner in between.
Scoop at least once a day, and follow your litter’s packaging for full replacement. Change it sooner if the litter stays damp, smells after scooping or stops clumping properly.
Quick Picks
Best for Firm Clumps: Dr. Elsey’s Ultra Unscented
Best Stainless Steel Box: Tevila Stainless Steel with High Sides
Best Deodorizer Between Changes: Arm & Hammer Double Duty Deodorizer
Why Scooping Isn’t Enough
Scooping removes clumps and solid waste, but small amounts of soiled litter can remain behind. Clumps can also break apart during scooping, leaving damp pieces mixed through the clean litter.
Non-clumping litter holds urine in the litter rather than forming scoopable urine clumps. Follow the bag’s directions for full replacement, and change it sooner if the litter becomes saturated or odor remains.
Topping up with fresh litter helps for a while, but the old litter underneath still holds odor. Eventually the box needs a reset.
Signs It’s Time to Change the Litter
A realistic comparison showing how cat litter changes from clean to used and when it’s time for a full change.
The box smells right after scooping. A freshly scooped box should smell close to neutral. A strong ammonia smell right after scooping can mean the remaining litter is saturated or overdue for replacement.
Clumps stick or fall apart. If clumps are suddenly sticking, crumbling or becoming harder to remove cleanly, the litter may no longer be performing as it did when fresh.
The litter feels damp or looks soiled outside the scoopable clumps. That’s a sign the remaining litter may need replacing.
The litter has broken down. If a normally granular litter has become noticeably dusty, crumbly or full of small damp pieces, a fresh change may make the box easier to scoop and keep clean.
A Simple Routine
A typical litter box setup during daily use, showing how litter looks between scooping and full changes.
Daily: scoop at least once, and more often for a busy or shared box. Check whether clumps hold together and whether anything sticks to the bottom.
As needed: top up to the depth recommended on the litter bag.
At each full change: empty the box completely, wash it with hot water or a small amount of mild unscented soap, rinse and dry it fully, and refill with fresh litter. Our guide to the best way to clean a litter box covers the full method.
A complete litter box setup showing the tools used for daily scooping and regular cleaning.
What Helps Keep the Box Cleaner Between Changes
A firm-clumping litter. Crumbly clumps leave damp pieces behind, so the box smells sooner. A litter that forms hard clumps, like Dr. Elsey’s Ultra Unscented, lifts out cleanly and leaves less behind.
A box less likely to retain lingering odor. Worn plastic can hold onto odor that comes back even after a full change. A stainless steel box like the Tevila Stainless Steel Litter Box with High Sides resists scratching better than plastic and is less likely than worn plastic to retain lingering odor. Several reviewers also say waste releases easily from its smooth surface. Our stainless steel vs plastic litter box comparison covers the difference.
A deodorizer, if your cat accepts it. Something like Arm & Hammer Cat Litter Deodorizer Double Duty can help a clean box stay fresher between scoops. It won’t replace a full change. Our best cat litter deodorizer guide compares options.
Enough boxes. Two cats sharing one box saturates the litter much faster. See how many litter boxes per cat you need.
Frequently Asked Questions
Why does my litter box still smell after I change the litter?
The box itself may be holding odor, especially if it’s worn plastic. A shallow litter layer can also let urine reach the bottom. If washing doesn’t help, it may be time for a new box.
Can I just keep adding fresh litter instead of changing it?
Top up as your litter’s directions recommend, but don’t use topping up as a substitute for a full replacement when the manufacturer calls for one. If odor remains after scooping or the litter stays damp or stops performing properly, change it sooner.
How often should I replace the litter box itself?
Replace the box when odor remains after a thorough wash, or when the surface is badly worn or damaged and difficult to clean.
How often should I scoop?
At least once a day. Our guide on how often you should scoop a litter box covers it in more detail.
