Species · Michigan · BBS 2025 Release · 1966–2024
Kirtland's Warbler Population Trend in Michigan
Kirtland's Warbler in Michigan has surged: up 269% on the route-weighted index since 2000.
+269%Since 2000
10Routes In State
26Years
Notable Kirtland's Warbler Trends in Michigan
long arc increasecomputed index
Kirtland's Warbler has surged in Michigan: up 269% on the route-weighted index since 2000.
Kirtland's Warbler Population Forecast in Michigan
If the recent trend holds, Kirtland's Warbler in Michigan is projected to stay roughly flat through 2029, near 0.16 (95% range 0.08–0.25). A 5-year backtest shows a typical error of ±56.9%, with 60% of held-out values landing inside the 95% band.
+9%Change by 2029
0.16Projected 2029 index
0.08–0.2595% range
±56.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.15 | 0.06 | 0.23 |
| 2026 | 0.15 | 0.07 | 0.23 |
| 2027 | 0.15 | 0.07 | 0.24 |
| 2028 | 0.16 | 0.07 | 0.24 |
| 2029 | 0.16 | 0.08 | 0.25 |
Kirtland's Warbler Survey Routes in Michigan
| Sand Lake | 7 | 2024 | 2013 |
| Red Oak | 5 | 2022 | 1986 |
| Skeels | 3 | 2011 | 2000 |
| Mayfield | 1 | 2014 | 2014 |
| Hiawatha Nf | 1 | 2013 | 2013 |
| Betchler Lks | 1 | 2016 | 2007 |
| Ishpeming | 1 | 2010 | 2010 |
| Scott'S Marsh | 1 | 2008 | 2008 |
| Skegemog Pt | 1 | 2013 | 2002 |
| Big Island Lake | 1 | 2009 | 2009 |
Kirtland's Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.