Quick scoop: Gaura lindheimeri ‘Belleza Dark Pink’ is usually hardy to about -10°F / -23.3°C , which matches USDA Zone 6a–9b. In practical terms, it’s a good perennial for spots that don’t stay waterlogged in winter.

Cold tolerance

  • Lowest listed hardiness: -10°F (-23.3°C).
  • Reliable outdoor range: Zones 6–9.
  • Zone 5: it may survive in a protected microclimate, but winter success is less certain.

What matters most

Cold isn’t the only issue for this plant. Winter wetness and poor drainage can be just as damaging as freezing temperatures. If you’re growing it in a borderline-cold area, a dry, well-drained site gives it the best chance.

Practical rule of thumb

  • Safe bet: zones 6–9.
  • Possible with protection: zone 5 , especially with snow cover and good drainage.
  • Riskier: areas colder than -10°F or places with soggy winter soil.

If you want a single number

For a quick answer, assume it can handle down to about -10°F.

If you want, I can also give you a winter care tip list for keeping it alive in a colder garden.