Litter & Litter Tech
Best High Sided Litter Boxes (2026)
Two different problems both get called 'my cat misses the box', and only one of them is solved by taller walls.
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Everyone in this category says they tested twenty litter boxes. We have not tested any, and we say so. What we do instead: compile the published specs, read the manuals, and do the arithmetic on what this gear costs to run and how it behaves once there is more than one cat using it. Every spec is linked to the document it came from. Prices are checked daily — last verified January 1, 1970. Here is exactly how we pick.
Quick picks
Ranked on the published specs and the arithmetic below. Tap any row to jump to the full write-up. We have not tested these — here is exactly how we pick.
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | No photo Frisco High-Sided Cat Litter Box, XL 24-in Publishes its interior floor dimensions, not just the outside -- which is the only honest way to compare litter boxes and is rare enough to be a reason to buy. | Sprayers, on a budget | 7.6 | |
| 2 | No photo IRIS USA XX-Large Open Top Litter Box At 30.18 by 20.13 inches this is the largest open-top pan in general retail, and floor area is the single spec that decides whether two cats will share a box. | The biggest floor area you can buy | 8.7 | |
| 3 | No photo Petmate Jumbo Litter Pan The plain plastic pan that lets you follow the one-box-per-cat-plus-one rule without spending like it. | Extra boxes, cheaply | 7.4 |
#ad Buy links are affiliate links. Prices come from a live daily check; where we have no verified price we say "check price" rather than print a stale one.
“My cat misses the box” describes two completely different mechanical problems. Taller walls fix one of them and make the other slightly worse.
Which problem do you have
| What you see | Mechanism | What fixes it |
|---|---|---|
| Wet patch outside, along one wall | Cat urinates at a higher angle than the wall catches | Taller sides, at least 8 inches on three faces |
| Litter sprayed across the floor | Digging, kicking on the way out | A wider box and a mat, not a taller one |
| Waste beside the box, cat visibly reluctant | The cat cannot comfortably get in | A lower entry -- see our senior box page |
Our diagnostic table, not a manufacturer's. Getting this wrong is why people buy a second box that does not help.
What the three publish
The Frisco High Sided XL is the direct answer to the height problem, and the reason it leads here is that it pairs the tall walls with a cut-down entry rather than asking a cat to climb the full wall.
The IRIS XXL open top is the floor-area answer. Its published 607 square inches is the largest single pan we track, and for a digger that space is worth more than another two inches of wall.
Petmate’s jumbo pan is the honest baseline. It is cheap, it is what most households already have, and knowing what it does not solve is the point of comparing it.
The trade you are making
Every inch of wall you add is an inch a cat has to clear. In a single-cat house with a young cat that is free. In a multi-cat house with a range of ages, it is not, and the answer is to mix box types rather than standardize on one.
That is the same argument our multi-cat litter setup makes about placement: the point of Cornell Feline Health Center’s one-more-box-than-cats guidance is choice, and boxes that are all identical only give a cat one choice repeated.
What high sides do not fix
Litter leaves a box two ways: kicked, and carried on paws. Walls stop the first and do nothing about the second, which is the larger share. If your actual complaint is granules across the hallway, our tracking guide deals with the carried half, and a mat sized to the box is where to start.
The picks in full
Specs are the manufacturer's own, linked to the page they came from. Prices come from a live daily check; where we have no verified price we say so rather than print a stale one.
Frisco High-Sided Cat Litter Box, XL 24-in
Frisco · Litter box · Our score 7.6/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
Publishes its interior floor dimensions, not just the outside -- which is the only honest way to compare litter boxes and is rare enough to be a reason to buy.
Published specs
| External dimensions | 24" L x 18" W x 10" H |
|---|---|
| Internal floor | 19.75" L x 12.875" W |
| Wall height | 10" |
| Litter type | Any |
Source: Chewy -- Frisco High-Sided Cat Litter Box XL 24-in listing
24 x 18 = 432 sq inches outside. Frisco publishes the interior floor as 19.75 x 12.875 = 254 sq inches. You lose 41 percent of the footprint to sloped walls -- which is exactly why comparing boxes on external dimensions misleads you.
What the specs favor
- Publishes internal floor dimensions, which almost no maker does
- 10-inch walls contain a standing sprayer
- Cheapest way to get past 250 square inches of usable floor
- Open top
What they don't
- Loses 41 percent of its footprint to sloped walls
- No scatter shield, so litter still leaves with the cat
- 10-inch walls are still a climb for an old cat
You are buying one box for three cats. 254 square inches of usable floor is a single-cat box being asked to do a household's work.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
IRIS USA XX-Large Open Top Litter Box
IRIS USA · Litter box · Our score 8.7/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
At 30.18 by 20.13 inches this is the largest open-top pan in general retail, and floor area is the single spec that decides whether two cats will share a box.
Published specs
| External dimensions | 30.18" L x 20.13" W x 13.12" H |
|---|---|
| Type | Open top with scatter shield |
| Litter type | Any |
| Weight capacity | Not published |
Source: Amazon -- IRIS USA XX-Large open top litter box listing
30.18 x 20.13 = 607 sq inches of external footprint. Two cats sharing it get roughly 304 sq inches each -- still more than a whole standard jumbo pan gives one cat. That is why one very large box beats two small ones when floor space is tight.
What the specs favor
- Largest published open-top footprint here at 30.18 x 20.13 inches
- 13.12-inch walls with a scatter shield -- the combination that stops high sprayers
- Open top, the configuration cats are documented to prefer
- Takes any litter, no proprietary anything
What they don't
- 607 square inches of floor is a lot of floor to give up
- IRIS does not publish a weight capacity
- High walls make it a genuine step up for a senior cat
Your cat is elderly or arthritic. A 13-inch wall is a real climb, and a cat that starts avoiding the box because getting in hurts is a much worse problem than litter scatter.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Petmate Jumbo Litter Pan
Petmate · Litter box · Our score 7.4/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
The plain plastic pan that lets you follow the one-box-per-cat-plus-one rule without spending like it.
Published specs
| External dimensions | 22.05" x 16.55" x 6.5" |
|---|---|
| Wall height | 6.5" |
| Type | Open pan, no cover |
| Litter type | Any |
Source: Amazon -- Petmate 22184 Jumbo Litter Pan listing
Cornell's guidance is one box more than you have cats. For three cats that is four boxes. The cheapest automatic box on this page is $269.99 -- four plain jumbo pans is a fraction of one of those, and four boxes beat one clever one every time.
What the specs favor
- Cheap enough to buy four without thinking about it
- 22 inches long, which is genuinely jumbo for a plain pan
- Open, uncovered, low -- the configuration cats prefer
- Nothing to break, nothing proprietary
What they don't
- 6.5-inch walls will not contain a cat that sprays standing up
- No scatter shield at all
- Thin plastic scratches, and scratched plastic holds odor
Odor or scatter is your actual complaint. This pan solves the count problem, not the containment problem -- pair it with a high-sided box rather than replacing one.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Common questions
What is the best high sided litter box?
How high should litter box sides be?
Why does my cat pee over the side of the litter box?
Are high sided litter boxes bad for older cats?
Do high sided litter boxes reduce tracking?
Sources
Read next
- Best Litter Boxes for Senior Cats (2026)
Litter boxes ranked on published entry height for arthritic and older cats, with the step arithmetic worked through.
- Best Litter Boxes for Odor Control (2026)
Ranked on containment geometry rather than fragrance, with the covered-box trade-off stated plainly.
- Best Cat Litter Mats (2026)
Mats compared on published catch area against real box footprints, plus the pour-back feature that returns litter instead of binning it.
- How to Stop Cat Litter Tracking
The three mechanisms behind litter tracking and six fixes ordered by cost, starting with the free ones.
- Best Litter Boxes for Multiple Cats (2026)
Four boxes compared on interior floor area, wall height and what each one actually solves. Cheap pans beat clever ones more often than you would expect.