Invasive Plant Rules in Fort Collins, CO (2026)
1 verified invasive plant rules for Fort Collins, Colorado, sourced directly from the municipal code and official government pages.
Verified from official government sources
Prohibited Species
Fort Collins's nuisance code bans growing any of dozens of named noxious weed species regardless of height. Municipal Code § 20-41 defines 'Weed' with an exhaustive list, from Canada thistle and leafy spurge to purple loosestrife and marijuana, and § 20-42(h) makes it unlawful for an owner or occupant to permit any of them to grow on their property.
Fort Collins Prohibits Growing Noxious Weeds
Significant RestrictionsFort Collins Municipal Code § 20-41; § 20-42(h)
Weed shall mean an aggressive, non-native herbaceous plant detrimental to native plant communities or agricultural lands, including but not limited to jointed goatgrass (Aegilops cylindrica), quackgrass (Agropyron repens), redroot pigweed (Amaranthus retroflexus), common ragweed (Ambrosia artemisiifolia), ... Canada thistle (Cirsium arvense), bindweed (Convolvulus arvensis), leafy spurge (Eupho...
Looking for Larimer County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Fort Collins city rules.
Invasive Plant Rules in Larimer County →