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Yes, it is possible for a hellebore to grow to about 3 feet tall, especially depending on the variety and growing conditions. Hellebores are typically known for being shorter plants, often around 1 to 2 feet tall, but some varieties can grow taller. Factors such as soil quality, watering, and sunlight can influence their size. If your hellebore is healthy, has plenty of flowers, and looks good overall, it is likely fine, even at that height.

Some varieties of hellebores, such as Helleborus x hybridus or Helleborus foetidus, can grow taller than the typical range. The height of 3 feet might be more common with hybrid types that have been bred for larger blooms and growth.

If the plant is stable and thriving, there's no need to worry. However, if it appears leggy or the flowers are sparse, that could indicate the need for better care, such as more sunlight or slightly better drainage. But in general, tall growth like this isn't unusual for certain varieties.

This collection of articles may help:

https://www.gardeningknowhow.com/ornamental/flowers/hellebore

You are in zone 6 and most hellebores are pretty hardy, some to zone 3. Some of the hybrids are hardy to zone 5, which may not have been enough protection in a container. Let the plant thaw out on its own and chances are good it will survive. Here are growing tips:

https://www.gardeningknowhow.com/ornamental/flowers/hellebore/growing-hellebores.htm

https://www.gardeningknowhow.com/ornamental/flowers/hellebore/growing-hellebore-in-containers.htm