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Boulder County, CO (shown in white) has 726.38 mi² of land area and 14.09 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 4,898.3' to a high of 14,258.5', with a weighted average of 7,370.4' above sea level.
Temperatures range from average lows around 13.4°F to average highs around 85.5°F. A year-round daily temperature averages 45°F. Average annual precipation is 23.1". With these temperatures and precipation, the majority of the county scores as an 5B using the USDA Plant Hardiness Zone Map (the standard by which gardeners and growers can determine which perennial plants are most likely to thrive in a location).
The estimated population of Boulder County is 329,384 with 131,663 households. These households are spread across 32 unique municipalties (not all shown).
