14 Colorado
In 2025, we had complete survey coverage across the state of Colorado (Figure 14.1).
14.1 Colorado Statewide: Total
Colorado Statewide: Total
We obtained results for Colorado Statewide: Total by compiling and jointly analyzing data from 41 strata.
Field technicians completed 296 of 297 planned surveys (100%) in 2025. Technicians conducted 3371 point counts within the 296 surveyed grid cells between May 13 and July 21. They detected 194 bird species, including 49 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 247 species that were detected in any year during which surveys were conducted, 57 of which are priority species. The data yielded robust density estimates (CV < 50%) for 116 species.
Bird Conservancy estimated the proportion of occupied plots throughout Colorado Statewide: Total for 247 species that were detected in any year during which surveys were conducted, 57 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 124 species.
14.2 All Other Lands in Colorado
All Other Lands in Colorado
We obtained results for All Other Lands in Colorado by compiling and jointly analyzing data from seven strata.
Field technicians completed all planned surveys (100%) in 2025. Technicians conducted 816 point counts within the 72 surveyed grid cells between May 13 and July 8. They detected 150 bird species, including 32 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 210 species that were detected in any year during which surveys were conducted, 53 of which are priority species. The data yielded robust density estimates (CV < 50%) for 67 species.
Bird Conservancy estimated the proportion of occupied plots throughout All Other Lands in Colorado for 210 species that were detected in any year during which surveys were conducted, 53 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 74 species.
14.3 Colorado BCR 10
Colorado BCR 10: Total
We obtained results for Colorado BCR 10: Total by compiling and jointly analyzing data from four strata.
Field technicians completed all planned surveys (100%) in 2025. Technicians conducted 255 point counts within the 19 surveyed grid cells between May 24 and June 29. They detected 91 bird species, including 22 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 130 species that were detected in any year during which surveys were conducted, 30 of which are priority species. The data yielded robust density estimates (CV < 50%) for 21 species.
Bird Conservancy estimated the proportion of occupied plots throughout Colorado BCR 10: Total for 130 species that were detected in any year during which surveys were conducted, 30 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 23 species.
All Other Lands in Colorado BCR 10
We obtained results for All Other Lands in Colorado BCR 10 by compiling and analyzing data from one stratum.
Field technicians completed all planned surveys (100%) in 2025. Technicians conducted 72 point counts within the 5 surveyed grid cells between May 24 and June 18. They detected 62 bird species, including 15 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 114 species that were detected in any year during which surveys were conducted, 28 of which are priority species. The data yielded robust density estimates (CV < 50%) for 11 species.
Bird Conservancy estimated the proportion of occupied plots throughout All Other Lands in Colorado BCR 10 for 114 species that were detected in any year during which surveys were conducted, 28 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 12 species.
14.4 Colorado BCR 16
Colorado BCR 16: Total
We obtained results for Colorado BCR 16: Total by compiling and jointly analyzing data from 27 strata.
Field technicians completed 207 of 208 planned surveys (100%) in 2025. Technicians conducted 2309 point counts within the 207 surveyed grid cells between May 14 and July 21. They detected 164 bird species, including 45 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 199 species that were detected in any year during which surveys were conducted, 54 of which are priority species. The data yielded robust density estimates (CV < 50%) for 89 species.
Bird Conservancy estimated the proportion of occupied plots throughout Colorado BCR 16: Total for 199 species that were detected in any year during which surveys were conducted, 54 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 97 species.
All Other Lands in Colorado BCR 16
We obtained results for All Other Lands in Colorado BCR 16 by compiling and analyzing data from one stratum.
Field technicians completed all planned surveys (100%) in 2025. Technicians conducted 189 point counts within the 19 surveyed grid cells between May 15 and July 8. They detected 110 bird species, including 20 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 180 species that were detected in any year during which surveys were conducted, 44 of which are priority species. The data yielded robust density estimates (CV < 50%) for 34 species.
Bird Conservancy estimated the proportion of occupied plots throughout All Other Lands in Colorado BCR 16 for 181 species that were detected in any year during which surveys were conducted, 45 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 39 species.
14.5 Colorado BCR 18
Colorado BCR 18: Total
We obtained results for Colorado BCR 18: Total by compiling and jointly analyzing data from ten strata.
Field technicians completed all planned surveys (100%) in 2025. Technicians conducted 807 point counts within the 70 surveyed grid cells between May 13 and June 12. They detected 116 bird species, including 20 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 205 species that were detected in any year during which surveys were conducted, 40 of which are priority species. The data yielded robust density estimates (CV < 50%) for 37 species.
Bird Conservancy estimated the proportion of occupied plots throughout Colorado BCR 18: Total for 205 species that were detected in any year during which surveys were conducted, 40 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 44 species.
Colorado BCR 18 Rivers
We obtained results for Colorado BCR 18 Rivers by compiling and jointly analyzing data from two strata.
Field technicians completed all planned surveys (100%) in 2025. Technicians conducted 74 point counts within the 8 surveyed grid cells between May 15 and June 8. They detected 79 bird species, including 9 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 178 species that were detected in any year during which surveys were conducted, 31 of which are priority species. The data yielded robust density estimates (CV < 50%) for 16 species.
Bird Conservancy estimated the proportion of occupied plots throughout Colorado BCR 18 Rivers for 178 species that were detected in any year during which surveys were conducted, 31 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 30 species.
Colorado BCR 18: Total
We obtained results for Colorado BCR 18: Total by compiling and jointly analyzing data from five strata.
Field technicians completed all planned surveys (100%) in 2025. Technicians conducted 555 point counts within the 48 surveyed grid cells between May 13 and June 12. They detected 89 bird species, including 16 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 135 species that were detected in any year during which surveys were conducted, 26 of which are priority species. The data yielded robust density estimates (CV < 50%) for 30 species.
Bird Conservancy estimated the proportion of occupied plots throughout Colorado BCR 18: Total for 135 species that were detected in any year during which surveys were conducted, 26 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 35 species.
Non-river Lands in Colorado BCR 18
We obtained results for Non-river Lands in Colorado BCR 18 by compiling and jointly analyzing data from eight strata.
Field technicians completed all planned surveys (100%) in 2025. Technicians conducted 733 point counts within the 62 surveyed grid cells between May 13 and June 12. They detected 103 bird species, including 18 priority species.
Bird Conservancy estimated densities (birds per square kilometer) for 175 species that were detected in any year during which surveys were conducted, 36 of which are priority species. The data yielded robust density estimates (CV < 50%) for 34 species.
Bird Conservancy estimated the proportion of occupied plots throughout Non-river Lands in Colorado BCR 18 for 175 species that were detected in any year during which surveys were conducted, 36 of which are priority species. The data yielded robust occupancy estimates (CV < 50%) for 40 species.