No. Throw out cooked rice that sat at room temperature overnight — reheating it will not make it safe.
Rice has a specific risk that most other leftovers don't: a heat-resistant bacterium called Bacillus cereus, which can survive cooking as spores and then multiply if the rice cools slowly at room temperature.
That's why rice gets its own, stricter storage rules compared to something like pasta or vegetables.
Bacillus cereus spores that survive cooking can germinate and multiply once rice sits between about 40°F and 140°F (4°C to 60°C) — the "danger zone" — for more than 2 hours. Left out overnight, that's many hours inside the danger zone, long enough for bacteria to produce toxins that reheating doesn't destroy. This is different from most bacteria, which cooking reliably kills off.
Heat kills the bacteria itself but not the toxins some strains have already produced. That's the core problem: the rice can look, smell, and taste completely normal and still cause vomiting or diarrhea within hours of eating it. Symptoms usually show up fast, often within 1 to 5 hours, and typically resolve within a day, but that's still an unnecessary risk for a food that's cheap to remake.
If cooked rice was left on the counter overnight, throw it away rather than testing it. This applies to plain rice, fried rice, and rice-based dishes like risotto — the risk comes from the rice itself, not what's mixed into it. The same overnight rule applies to other starches like pasta and potatoes too, though the specific bacteria of concern differ.
White rice, brown rice, and fried rice are all equally at risk once they've sat out too long — the danger comes from time and temperature, not the variety of rice. Restaurant-style fried rice gets its bad reputation mainly because it's often made from rice that was cooked, cooled slowly, and stored the day before, which is exactly the pattern to avoid at home too.
Rice is one of the few foods where "it still looks fine" doesn't apply. If it sat out overnight, it goes in the trash, no exceptions.
The bacteria can be killed, but toxins some strains already produced while the rice sat out are heat-stable and survive reheating.
Up to 2 hours at normal room temperature, or 1 hour if the room is above 90°F (32°C). Past that, refrigerate it or discard it.
Yes — it's the informal name for Bacillus cereus food poisoning from rice left at room temperature too long, common with rice reheated for fried rice.
Yes, cooled rice freezes well for about a month and reheats fine from frozen, a good option if you won't eat it within a few days.