How cold hardy are Roman Chamomile plants?

Roman chamomile (Chamaemelum nobile) is relatively cold hardy and can tolerate temperatures down to USDA Zone 4, which means it can survive winter temperatures as low as -30°F (-34°C). These perennial plants thrive in cooler climates and can withstand frost, making them suitable for various temperate regions. However, they may require some protection in extreme conditions or heavy snowfall to ensure their survival.