How long do dried beans need to soak?

Why soak beans at all

Soaking does three things: (1) rehydrates dried beans so they cook more evenly, (2) leaches out some indigestible oligosaccharides (the gas-causing sugars), (3) cuts cooking time by 30-50%. Modern science (especially pressure-cooker testing) has shown soaking is OPTIONAL — but it produces more uniform texture and reduces total kitchen time.

Three soak methods (ranked by results)

1. Long cold soak (the canonical method): 8-12 hours in cold water, ratio 4 cups water per 1 cup dried beans. Add 1 Tablespoon salt to the soak water (American Test Kitchen tested — salted soak produces creamier, less-blowout texture vs unsalted). Drain, rinse, cook. Best texture.

1. Quick soak: Bring beans + 4 cups water + 1 Tbsp salt to boil, simmer 2 minutes, cover and rest 1 hour. Drain, rinse, cook. Good texture, faster than overnight.

1. No soak (pressure cooker only): Direct to Instant Pot with water + salt + aromatics. Cook 35-50 min on high pressure (varies by bean). Natural release 15 min. Acceptable texture, fastest start-to-finish.

Cooking times AFTER soaking (stovetop simmer)

• Black beans: 60-90 minutes
• Pinto beans: 60-90 minutes
• Kidney beans: 90-120 minutes
• White beans (cannellini, navy, great northern): 60-90 minutes
• Chickpeas (garbanzo): 90-120 minutes
• Lentils (split red): no soak needed, 15-20 min
• Lentils (whole green/brown): no soak needed, 25-30 min
• Black-eyed peas: quick-soak or none, 30-45 min after soaking
• Lima beans: 60-75 minutes
• Pinto beans for refried: 90-120 minutes (need extra-soft)

Why salting the soak water matters

Salt during soaking softens bean skins (sodium displaces calcium and magnesium in the skin's pectin). Result: creamier interiors, less skin-bursting, more even cooking. This is opposite of the old wisdom "salt toughens beans" — that myth referred to adding salt at the END of cooking, when beans are nearly done, which CAN slow softening if added before they're 80% tender.

The "soaking water reduces gas" question

Yes — discarding soak water removes 35-50% of the oligosaccharides that cause flatulence (raffinose, stachyose). Trade-off: also removes minerals + some flavor. Most published cooks recommend discarding for digestion benefit; some traditional cuisines keep it for flavor.

Pressure cooker shortcut (most efficient method overall)

Skip soaking entirely. Add 1 cup dried beans + 3 cups water + 1 tsp salt + bay leaf to Instant Pot. Cook on high pressure: - Black beans: 35 min - Pinto beans: 35 min - Kidney beans: 45 min - Cannellini: 40 min - Chickpeas: 50 min Natural release 15 minutes. Total time including pressure-up: ~75 min. Beats the 8-hour overnight soak start-to-finish even though "cooking" is longer.

Cross-reference: see /pages/what-ratio-of/water-to-beans for cooking water ratios + /pages/how-long-does/lentils-cook for lentil-specific timing.