Geraniums can generally tolerate brief dips to around 32–40°F (0–4°C), but repeated frost or a hard freeze will damage or kill most common bedding geraniums, so they’re safest above about 45–50°F (7–10°C) at night.

Quick Scoop: How cold can geraniums tolerate?

  • Most common “annual” geraniums (pelargoniums in pots and beds) start to suffer below about 40°F (4°C), and frost at 32°F (0°C) can burn leaves and flowers or kill the plant if it lasts.
  • They are not truly frost-hardy; you should bring them in or cover them when frost is forecast.
  • Hardy perennial geraniums (often called cranesbills) are a different group and can tolerate much colder conditions, in some cases down to around 20°F (−6°C) or even lower depending on variety.
  • For reliable outdoor growth, aim to keep tender/pot geraniums where nights are consistently above 50°F (10°C), which is when they grow and bloom best.

Simple rule of thumb

  • If you’re growing classic balcony or pot geraniums: treat 40°F (4°C) as the danger zone and protect them from any frost.
  • If you have named “hardy geranium” or “cranesbill” varieties in the ground: check the specific variety, but many can overwinter in typical temperate climates well below freezing.

Mini FAQ

  • Will geraniums survive 40°F (4°C)?
    Sometimes yes, but repeated nights that cold can stress them; they won’t be happy and may stop flowering.
  • What’s the lowest temp for common bedding geraniums?
    Around 32°F (0°C) for a short time; any real frost is risky, and prolonged cold near freezing can kill them.
  • When should I bring pots indoors?
    As soon as forecasts dip into the low 40s°F and especially if frost is mentioned, move them to a cool, bright, frost‑free spot.

“If frost is in the forecast, geraniums are better off indoors than taking their chances outside overnight.” 🌱

Information gathered from public forums or data available on the internet and portrayed here.