How to Drill Terracotta Pots | Drainage Holes Without Cracks

The right way to drill a terracotta pot comes down to patience more than muscle. Push too hard, spin too fast, or skip the water, and the clay will crack — usually right when you think it’s going well. The fix for adding drainage holes to terracotta pots is a slow drill, a wet surface, and the right bit. Here’s the exact sequence that works.

What Bit Do You Need For Terracotta?

A masonry bit is the standard choice, but carbide-tipped masonry, ceramic/tile, and diamond drill bits all work well on unglazed terracotta. Diamond bits tend to last longer and cut smoother, though they cost more.

Skip the hammer or impact function on your drill — the percussive action shatters clay instead of cutting it. Keep the tool in its normal rotary mode.

For most pots under half an inch thick, a 1/4-inch to 3/8-inch bit suits drainage holes well.

Step-By-Step: Drilling Your Pot

Set the pot upside down on a flat, stable surface. A piece of scrap wood or a folded towel underneath stops the pot from rocking and gives the drill a clean exit point.

1. Mark the spot. Choose locations on the base, spaced apart, and keep holes at least half an inch from the pot’s edges and any molded weak spots.
2. Add tape. Press a piece of painter’s or masking tape over the mark. It stops the bit from wandering on the smooth clay surface and reduces chipping.
3. Start at an angle. Begin drilling at about 45 degrees to create a small groove or notch. Once the bit bites in and won’t slide, gradually bring the drill upright.
4. Keep it wet. Hold a damp sponge against the drill area, spray it with a misting bottle, or keep a shallow puddle on the spot. Water cools the bit and flushes away clay dust.
5. Use light pressure. Let the bit do the work. Gentle, steady pressure beats forcing the drill through the clay, which is the fastest way to crack the pot.
6. Pause and clear. Lift the bit occasionally to clear debris and re-wet the area, especially on thicker pot bases.
7. Finish clean. Once the hole breaks through, remove the tape, rinse away the dust, and check for cracks. Sand the rim if the edges are rough.

You’ll know it worked when a clean hole passes through the base without chips radiating from the rim.

Common Mistakes That Crack Pots

• Too much pressure. The bit cuts best with the drill’s weight doing the work. Pushing hard is the number one cause of shattered pots.
• Drilling dry. Heat builds fast in clay, and friction plus heat equals cracks. Water isn’t optional — it’s the cooling system.
• Starting straight-on. A flat bit on a smooth surface slides around instead of catching. The angled start creates the groove the bit needs to bite.
• Holes near the edge. Thin sections and rim areas are structural weak points. Keep drainage holes in the base, away from the edges.
• Using hammer mode. The impact function is for concrete, not clay. It shakes the pot apart at the fracture line.

If your pot is especially thin or you’re nervous about the first drill, practice on a cheap saucer first — the technique transfers directly, and you’ll build confidence with a pot you don’t mind losing.

Does This Work On Glazed Or Ceramic Pots?

Yes, with one adjustment. The same technique applies to glazed pots, but the glaze is slicker and harder than bare clay, so use a diamond or carbide-tipped tile bit and let it take even longer to break through the surface. A glaze that cracks can spider-web across the pot, so keep the surface wet and resist the urge to speed up.

If you’re drilling a pot that will hold water, consider what’s inside. This method works well for keeping succulents and other water-sensitive plants healthy — and if you’re looking to upgrade your container collection, our roundup of the best shallow terracotta pots for succulents covers tested options that suit shallow-rooted plants.