How Often Should You Really Change Cat Litter?

A practical guide to scooping, topping up, and full changes — without overthinking it.

There's a short answer and a long answer.

The short answer: scoop daily, top up weekly, do a full change every two to four weeks. Most households can stop reading there.

The long answer is for everyone whose routine doesn't quite fit that — multi-cat homes, sensitive cats, automatic boxes, or anyone whose tray seems to need attention more often than it should.

The three jobs, not one

Cat litter maintenance isn't a single task. It's three jobs, done at different intervals.

Scooping is the daily job. Clumps and solids out, fresh litter levelled, two minutes total. Done once a day for a single cat, twice a day for two or more.

Topping up is the weekly job. Litter gets carried out on paws, absorbed into clumps, and slowly depleted. A quick top-up keeps the bed at a consistent depth — usually three to four centimetres — so clumping stays effective.

The full change is the periodic job. Empty the tray, wash it, refill with fresh litter. How often this needs to happen depends almost entirely on the litter you use.

What actually drives the schedule

Three things determine how often you'll need a full change: the number of cats, the type of litter, and the size of the tray.

One cat in a generously sized tray with a high-quality clumping litter can go three to four weeks between full changes. Add a second cat and you're looking at every two weeks. Three or more, and weekly is realistic.

Litter type matters more than most people expect. Conventional clay-based litters absorb urine throughout the bed, which means odour builds up everywhere — not just in the clumps you remove. The whole tray reaches a tipping point, and the only fix is a full change.

Plant-based litters work differently. Cassava starch clumps tightly at the point of contact and locks odour into the clump itself, so the surrounding bed stays neutral for longer. With Snow, that often translates to fewer full changes — every three to four weeks rather than every one to two.

The cleaner the clump, the longer the rest of the tray stays fresh. That's the whole maintenance equation.

Signs you've left it too long

Most people change too late, not too early. The tells are subtle before they're obvious.

A faint ammonia smell when you walk past the tray means urine is breaking down somewhere the clumps aren't catching. A cat hovering at the edge of the tray, or doing their business right beside it, is sending a clearer message. Tracking that suddenly increases — granules appearing further from the tray than usual — often means the bed has been disturbed too many times without a refresh.

Cats are fastidious. If yours is acting unusual around the tray, the tray is the first place to look.

A note on automatic boxes

Automatic litter boxes change the rhythm. They scoop continuously, which means the daily job disappears — but the weekly top-up becomes more important, and the full change cycle shifts.

Terra is built for this setup. The cassava-mineral blend holds shape through repeated mechanical scooping without breaking down into fines. In a single-cat auto box, a full change every three to four weeks is typical. The tray itself still needs washing on the same schedule.

Keep it simple

Daily scoop. Weekly top-up. Full change every two to four weeks, depending on your setup.

If your litter is doing its job, the schedule should feel light. If it isn't, the schedule will tell you — usually before your cat does.