Why Tomatoes Crack and Split (and How to Stop It)

GardenDraft Team · June 16, 2026 · 5 min read

Part of: Plant Problems & Pest Guides

You walk out after a summer rain to find your nearly-ripe tomatoes split open (rings around the top, or a crack running down the side). It's one of the most common and most frustrating tomato problems, and the cause is almost always the same: water, arriving unevenly.

Why tomatoes crack and split

A tomato cracks when the inside grows faster than the skin can stretch. After a dry spell, a sudden flush of water, whether a heavy rain or a deep watering of a thirsty plant, makes the fruit take up water fast and swell, and the skin, which had slowed its growth during the dry period, can't keep up. So it splits. There are two patterns: concentric cracks form rings around the stem end, and radial cracks run from the stem down the side. Both come from the same root cause — an uneven water supply — and both tend to happen as fruit approaches ripeness, when the skin is thinning.

The fix is steady moisture

Since the problem is fluctuation, the solution is consistency:

• Water deeply and regularly rather than letting the soil swing from bone-dry to soaked. Even, predictable moisture keeps the fruit growing at a steady pace the skin can match. This is the same principle behind preventing blossom end rot — see how often to water.
• Mulch. A thick mulch is the most effective single tool, because it buffers the soil against exactly the wet-dry swings that cause cracking: it holds moisture through dry spells and slows the rush after rain.
• Pick ahead of big rain. When a heavy storm is forecast and you have fruit that's nearly ripe, harvest it. A tomato showing color will finish ripening perfectly fine indoors, and you'll beat the split.

A few longer-term levers

Some varieties are bred to be crack-resistant with tougher, more elastic skins — worth seeking out if your climate brings erratic summer rain. Cherry tomatoes, with their thin skins, are especially prone, so pick them promptly as they color. And a lightly cracked tomato is still perfectly good to eat right away. Just use it soon, since the open skin invites rot and insects if it sits on the vine. The deeper point is that most tomato fruit problems, cracking included, trace back to water management, which is why steady watering and mulch quietly prevent so much trouble at once. For other leaf and fruit symptoms, work through the tomato leaf diagnosis guide.