The red spruce tree grows at a rate of 1 foot per year.
Although in the beginning the red spruce tree can be slow growing for a few years but after that the red spruce tree starts growing faster.
In 20 years the red spruce tree can grow up to 20 feet to 25 feet tall.
In 30 years the red spruce tree may reach heights of 30 feet tall.
Sometimes the red spruce tree may grow a little fast than 1 foot per year but it depends on the climate and conditions.
In some growing conditions some red spruce trees might grow at a rate of 2 feet per year but the average growth rate is 1 foot or 1 foot 5 inches per year.