Season shown in 0 of Ohio's 88 counties. Its mapped range covers 88. Explore Ohio
No result yet (0)
Within its mapped range (31)
Recorded, too few records for a result (50)
Recorded, season not shown (7)
Season shown (0)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Range: USGS Gap Analysis Project, Species Range Maps CONUS_2001 (2018). Show as a table
Counties as a table
Hooded Merganser by Ohio county: records and mapped range
County
Records
In mapped range
Adams County
No qualifying records yet
Yes: year-round
Allen County
No qualifying records yet
Yes: year-round
Ashland County
No qualifying records yet
Yes: year-round
Ashtabula County
Recorded, too few records for a result
Yes: year-round
Athens County
Recorded, too few records for a result
Yes: year-round
Auglaize County
Recorded, too few records for a result
Yes: year-round
Belmont County
No qualifying records yet
Yes: year-round
Brown County
Recorded, too few records for a result
Yes: year-round
Butler County
Recorded, too few records for a result
Yes: year-round
Carroll County
Recorded, too few records for a result
Yes: year-round
Champaign County
Recorded, too few records for a result
Yes: year-round
Clark County
Recorded, too few records for a result
Yes: year-round
Clermont County
Recorded, too few records for a result
Yes: year-round
Clinton County
Recorded, too few records for a result
Yes: year-round
Columbiana County
Recorded, too few records for a result
Yes: year-round
Coshocton County
Recorded, too few records for a result
Yes: year-round
Crawford County
No qualifying records yet
Yes: year-round
Cuyahoga County
53 · Recorded, season not shown
Yes: year-round
Darke County
No qualifying records yet
Yes: year-round
Defiance County
Recorded, too few records for a result
Yes: year-round
Delaware County
Recorded, too few records for a result
Yes: year-round
Erie County
Recorded, too few records for a result
Yes: year-round
Fairfield County
No qualifying records yet
Yes: year-round
Fayette County
Recorded, too few records for a result
Yes: year-round
Franklin County
58 · Recorded, season not shown
Yes: year-round
Fulton County
No qualifying records yet
Yes: year-round
Gallia County
No qualifying records yet
Yes: year-round
Geauga County
Recorded, too few records for a result
Yes: year-round
Greene County
Recorded, too few records for a result
Yes: year-round
Guernsey County
No qualifying records yet
Yes: year-round
Hamilton County
43 · Recorded, season not shown
Yes: year-round
Hancock County
No qualifying records yet
Yes: year-round
Hardin County
Recorded, too few records for a result
Yes: year-round
Harrison County
Recorded, too few records for a result
Yes: year-round
Henry County
No qualifying records yet
Yes: year-round
Highland County
Recorded, too few records for a result
Yes: year-round
Hocking County
Recorded, too few records for a result
Yes: year-round
Holmes County
Recorded, too few records for a result
Yes: year-round
Huron County
No qualifying records yet
Yes: year-round
Jackson County
Recorded, too few records for a result
Yes: year-round
Jefferson County
Recorded, too few records for a result
Yes: year-round
Knox County
Recorded, too few records for a result
Yes: year-round
Lake County
23 · Recorded, season not shown
Yes: year-round
Lawrence County
No qualifying records yet
Yes: year-round
Licking County
Recorded, too few records for a result
Yes: year-round
Logan County
Recorded, too few records for a result
Yes: year-round
Lorain County
33 · Recorded, season not shown
Yes: year-round
Lucas County
31 · Recorded, season not shown
Yes: year-round
Madison County
No qualifying records yet
Yes: year-round
Mahoning County
Recorded, too few records for a result
Yes: year-round
Marion County
Recorded, too few records for a result
Yes: year-round
Medina County
Recorded, too few records for a result
Yes: year-round
Meigs County
No qualifying records yet
Yes: year-round
Mercer County
No qualifying records yet
Yes: year-round
Miami County
No qualifying records yet
Yes: year-round
Monroe County
Recorded, too few records for a result
Yes: year-round
Montgomery County
Recorded, too few records for a result
Yes: year-round
Morgan County
Recorded, too few records for a result
Yes: year-round
Morrow County
No qualifying records yet
Yes: year-round
Muskingum County
Recorded, too few records for a result
Yes: year-round
Noble County
No qualifying records yet
Yes: year-round
Ottawa County
Recorded, too few records for a result
Yes: year-round
Paulding County
No qualifying records yet
Yes: year-round
Perry County
Recorded, too few records for a result
Yes: year-round
Pickaway County
Recorded, too few records for a result
Yes: year-round
Pike County
No qualifying records yet
Yes: year-round
Portage County
Recorded, too few records for a result
Yes: year-round
Preble County
No qualifying records yet
Yes: year-round
Putnam County
No qualifying records yet
Yes: year-round
Richland County
Recorded, too few records for a result
Yes: year-round
Ross County
No qualifying records yet
Yes: year-round
Sandusky County
Recorded, too few records for a result
Yes: year-round
Scioto County
No qualifying records yet
Yes: year-round
Seneca County
No qualifying records yet
Yes: year-round
Shelby County
No qualifying records yet
Yes: year-round
Stark County
Recorded, too few records for a result
Yes: year-round
Summit County
144 · Recorded, season not shown
Yes: year-round
Trumbull County
Recorded, too few records for a result
Yes: year-round
Tuscarawas County
Recorded, too few records for a result
Yes: year-round
Union County
No qualifying records yet
Yes: year-round
Van Wert County
No qualifying records yet
Yes: year-round
Vinton County
No qualifying records yet
Yes: year-round
Warren County
Recorded, too few records for a result
Yes: year-round
Washington County
Recorded, too few records for a result
Yes: year-round
Wayne County
Recorded, too few records for a result
Yes: year-round
Williams County
Recorded, too few records for a result
Yes: year-round
Wood County
Recorded, too few records for a result
Yes: year-round
Wyandot County
Recorded, too few records for a result
Yes: year-round
Season
When it is recorded
In Lake County
Not enough evidence
The weeks are still too uncertain to show a season. Based on 23 records in 9 of the 10 years from 2016 to 2025, above the minimum of 20 records from 5 different years.
JanFebMarAprMayJunJulAugSepOctNovDec
Show over the bars
Recording in Lake County · records of all species each week, 29,200 in all
Records per week from 23 records in 9 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.
Show as a table
Records of Hooded Merganser in Lake County each week, and records of all species
Week
Records of Hooded Merganser
Years recorded
Records of all species
Jan 4–10
1
1
54
Jan 11–17
0
0
37
Jan 18–24
1
1
52
Jan 25–31
0
0
82
Feb 1–7
1
1
58
Feb 8–14
0
0
89
Feb 15–21
0
0
51
Feb 22–28
0
0
54
Mar 1–7
1
1
51
Mar 8–14
0
0
155
Mar 15–21
0
0
190
Mar 22–28
3
3
166
Mar 29 – Apr 4
0
0
234
Apr 5–11
1
1
425
Apr 12–18
0
0
525
Apr 19–25
1
1
522
Apr 26 – May 2
0
0
844
May 3–9
0
0
1,247
May 10–16
0
0
647
May 17–23
0
0
950
May 24–30
1
1
1,067
May 31 – Jun 6
2
2
1,073
Jun 7–13
0
0
1,320
Jun 14–20
0
0
1,088
Jun 21–27
0
0
1,052
Jun 28 – Jul 4
0
0
1,305
Jul 5–11
0
0
1,359
Jul 12–18
0
0
1,171
Jul 19–25
0
0
1,056
Jul 26 – Aug 1
0
0
1,193
Aug 2–8
0
0
1,090
Aug 9–15
0
0
745
Aug 16–22
1
1
1,084
Aug 23–29
0
0
847
Aug 30 – Sep 5
0
0
699
Sep 6–12
0
0
858
Sep 13–19
0
0
714
Sep 20–26
0
0
739
Sep 27 – Oct 3
0
0
731
Oct 4–10
0
0
723
Oct 11–17
0
0
475
Oct 18–24
0
0
425
Oct 25–31
1
1
371
Nov 1–7
0
0
271
Nov 8–14
1
1
271
Nov 15–21
1
1
197
Nov 22–28
2
2
182
Nov 29 – Dec 5
0
0
81
Dec 6–12
3
1
111
Dec 13–19
1
1
84
Dec 20–26
1
1
96
Dec 27 – Jan 2
0
0
289
In Ohio
Mid-November to early June, middle week Feb 8–14
Middle week · Feb 8–14
This week · Nov 8–14
JanFebMarAprMayJunJulAugSepOctNovDec
Show over the bars
Recording in Ohio · records of all species each week, 1,691,199 in all
Records per week from 1,060 records in 10 of the 10 years from 2016 to 2025. Shows when people recorded it, not how common it is. The grey bars show how many records of all species were made here each week, so you can see when recording itself was high or low; the season is not adjusted by them.
Recorded on 661 dates. Latest record: December 2025.
Show as a table
Records of Hooded Merganser in Ohio each week, and records of all species
Week
Records of Hooded Merganser
Years recorded
Records of all species
Jan 4–10
69
9
6,211
Jan 11–17
21
9
5,146
Jan 18–24
22
7
4,645
Jan 25–31
37
8
4,698
Feb 1–7
44
9
6,023
Feb 8–14
32
9
5,888
Feb 15–21
20
8
5,436
Feb 22–28
33
7
6,846
Mar 1–7
41
7
8,321
Mar 8–14
51
9
10,384
Mar 15–21
52
10
12,620
Mar 22–28
47
9
13,949
Mar 29 – Apr 4
46
9
19,661
Apr 5–11
34
7
26,860
Apr 12–18
16
7
39,925
Apr 19–25
21
6
41,623
Apr 26 – May 2
16
8
56,391
May 3–9
9
6
52,952
May 10–16
18
6
53,785
May 17–23
22
8
57,698
May 24–30
12
9
54,651
May 31 – Jun 6
17
8
53,099
Jun 7–13
7
3
53,700
Jun 14–20
15
6
56,625
Jun 21–27
13
5
55,361
Jun 28 – Jul 4
4
2
58,477
Jul 5–11
6
4
61,336
Jul 12–18
1
1
64,722
Jul 19–25
3
3
69,753
Jul 26 – Aug 1
3
3
59,416
Aug 2–8
1
1
59,712
Aug 9–15
2
2
55,994
Aug 16–22
2
2
54,328
Aug 23–29
1
1
51,772
Aug 30 – Sep 5
0
0
57,167
Sep 6–12
1
1
59,075
Sep 13–19
1
1
54,543
Sep 20–26
1
1
45,860
Sep 27 – Oct 3
0
0
43,180
Oct 4–10
1
1
37,841
Oct 11–17
1
1
30,824
Oct 18–24
3
3
21,156
Oct 25–31
6
4
19,021
Nov 1–7
17
7
14,172
Nov 8–14
19
8
12,621
Nov 15–21
50
9
7,965
Nov 22–28
51
9
8,136
Nov 29 – Dec 5
27
8
6,083
Dec 6–12
35
8
6,004
Dec 13–19
45
9
5,423
Dec 20–26
32
9
5,661
Dec 27 – Jan 2
32
7
8,459
What these results show
These results show when people recorded a species, not when or where it occurs. Missing weeks and low counts do not mean absence or scarcity, and counts are not abundance. Contributed records reflect where, when and what people chose to observe.
Identification
How to identify it
Telling it apart
From what Ohio’s records show. Only what the records support is shown.
Common MerganserMergus merganserOften confused in Ohio: 15 identifications in Ohio named one where the other was meant
BuffleheadBucephala albeolaOften confused in Ohio: 10 identifications in Ohio named one where the other was meant
Red-breasted MerganserMergus serrator175 identifications worldwide named one where the other was meant
Wood DuckAix sponsa70 identifications worldwide named one where the other was meant
MallardAnas platyrhynchos45 identifications worldwide named one where the other was meant
From iNaturalist’s similar-species counts, refreshed monthly: confusions in Ohio first, then worldwide. Only species with an Ohio result are listed.
Land cover where it is recorded
Land cover
Its recordsAll Ohio records
Open water
44%3%
Developed
28%49%
Wetland
13%5%
Farmland
6%11%
Forest
5%31%
Grassland and shrub
3%0.9%
From 350 records placed within 100 m, beside all Ohio records placed the same way. People record where they go, so this shows where records come from, not where the species lives. Land cover: USGS Annual NLCD, 2025 (opens in a new tab)
Sources
Where these results come from
Records from iNaturalist research-grade observations and expert-identified GBIF datasets, CC0, CC BY and CC BY-NC. Sources
Seasons use the published method and its evidence thresholds. Methods
A spreadsheet (CSV) with a link to each record, on iNaturalist or GBIF. Records whose location was hidden by the observer or the source are counted but not linked.
