Season shown in 0 of Ohio's 88 counties. Explore Ohio
No result yet (13)
Recorded, too few records for a result (57)
Recorded, season not shown (18)
Season shown (0)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Show as a table
Counties as a table
Bald-faced Hornet by Ohio county: records and mapped range
County
Records
Adams County
Recorded, too few records for a result
Allen County
Recorded, too few records for a result
Ashland County
Recorded, too few records for a result
Ashtabula County
20 · Recorded, season not shown
Athens County
Recorded, too few records for a result
Auglaize County
Recorded, too few records for a result
Belmont County
Recorded, too few records for a result
Brown County
Recorded, too few records for a result
Butler County
42 · Recorded, season not shown
Carroll County
Recorded, too few records for a result
Champaign County
Recorded, too few records for a result
Clark County
Recorded, too few records for a result
Clermont County
39 · Recorded, season not shown
Clinton County
Recorded, too few records for a result
Columbiana County
Recorded, too few records for a result
Coshocton County
Recorded, too few records for a result
Crawford County
Recorded, too few records for a result
Cuyahoga County
186 · Recorded, season not shown
Darke County
Recorded, too few records for a result
Defiance County
No qualifying records yet
Delaware County
28 · Recorded, season not shown
Erie County
Recorded, too few records for a result
Fairfield County
Recorded, too few records for a result
Fayette County
No qualifying records yet
Franklin County
223 · Recorded, season not shown
Fulton County
No qualifying records yet
Gallia County
No qualifying records yet
Geauga County
Recorded, too few records for a result
Greene County
22 · Recorded, season not shown
Guernsey County
Recorded, too few records for a result
Hamilton County
157 · Recorded, season not shown
Hancock County
Recorded, too few records for a result
Hardin County
Recorded, too few records for a result
Harrison County
No qualifying records yet
Henry County
No qualifying records yet
Highland County
Recorded, too few records for a result
Hocking County
Recorded, too few records for a result
Holmes County
Recorded, too few records for a result
Huron County
Recorded, too few records for a result
Jackson County
Recorded, too few records for a result
Jefferson County
Recorded, too few records for a result
Knox County
Recorded, too few records for a result
Lake County
33 · Recorded, season not shown
Lawrence County
Recorded, too few records for a result
Licking County
Recorded, too few records for a result
Logan County
No qualifying records yet
Lorain County
46 · Recorded, season not shown
Lucas County
64 · Recorded, season not shown
Madison County
Recorded, too few records for a result
Mahoning County
Recorded, too few records for a result
Marion County
Recorded, too few records for a result
Medina County
35 · Recorded, season not shown
Meigs County
No qualifying records yet
Mercer County
Recorded, too few records for a result
Miami County
Recorded, too few records for a result
Monroe County
No qualifying records yet
Montgomery County
62 · Recorded, season not shown
Morgan County
Recorded, too few records for a result
Morrow County
Recorded, too few records for a result
Muskingum County
Recorded, too few records for a result
Noble County
Recorded, too few records for a result
Ottawa County
Recorded, too few records for a result
Paulding County
No qualifying records yet
Perry County
Recorded, too few records for a result
Pickaway County
No qualifying records yet
Pike County
No qualifying records yet
Portage County
29 · Recorded, season not shown
Preble County
Recorded, too few records for a result
Putnam County
Recorded, too few records for a result
Richland County
Recorded, too few records for a result
Ross County
Recorded, too few records for a result
Sandusky County
Recorded, too few records for a result
Scioto County
Recorded, too few records for a result
Seneca County
Recorded, too few records for a result
Shelby County
No qualifying records yet
Stark County
40 · Recorded, season not shown
Summit County
118 · Recorded, season not shown
Trumbull County
Recorded, too few records for a result
Tuscarawas County
Recorded, too few records for a result
Union County
Recorded, too few records for a result
Van Wert County
Recorded, too few records for a result
Vinton County
Recorded, too few records for a result
Warren County
25 · Recorded, season not shown
Washington County
Recorded, too few records for a result
Wayne County
Recorded, too few records for a result
Williams County
Recorded, too few records for a result
Wood County
22 · Recorded, season not shown
Wyandot County
Recorded, too few records for a result
No mapped range from the range source used, the USGS Gap Analysis Project, which maps land vertebrates only.
Season
When it is recorded
In Warren County
Not enough evidence
The weeks are still too uncertain to show a season. Based on 25 records in 6 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 Warren County · records of all species each week, 16,872 in all
Records per week from 25 records in 6 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 Bald-faced Hornet in Warren County each week, and records of all species
Week
Records of Bald-faced Hornet
Years recorded
Records of all species
Jan 4–10
0
0
108
Jan 11–17
0
0
29
Jan 18–24
0
0
28
Jan 25–31
0
0
37
Feb 1–7
0
0
23
Feb 8–14
0
0
38
Feb 15–21
0
0
66
Feb 22–28
0
0
65
Mar 1–7
0
0
53
Mar 8–14
0
0
70
Mar 15–21
1
1
116
Mar 22–28
0
0
117
Mar 29 – Apr 4
0
0
396
Apr 5–11
0
0
254
Apr 12–18
0
0
324
Apr 19–25
0
0
336
Apr 26 – May 2
0
0
539
May 3–9
0
0
323
May 10–16
0
0
423
May 17–23
0
0
420
May 24–30
0
0
378
May 31 – Jun 6
0
0
696
Jun 7–13
1
1
759
Jun 14–20
0
0
727
Jun 21–27
0
0
558
Jun 28 – Jul 4
0
0
552
Jul 5–11
0
0
695
Jul 12–18
1
1
643
Jul 19–25
1
1
564
Jul 26 – Aug 1
3
2
530
Aug 2–8
0
0
491
Aug 9–15
1
1
720
Aug 16–22
8
6
565
Aug 23–29
1
1
534
Aug 30 – Sep 5
0
0
719
Sep 6–12
1
1
619
Sep 13–19
0
0
584
Sep 20–26
1
1
390
Sep 27 – Oct 3
4
3
403
Oct 4–10
0
0
264
Oct 11–17
1
1
277
Oct 18–24
0
0
266
Oct 25–31
0
0
204
Nov 1–7
0
0
159
Nov 8–14
1
1
141
Nov 15–21
0
0
78
Nov 22–28
0
0
220
Nov 29 – Dec 5
0
0
53
Dec 6–12
0
0
58
Dec 13–19
0
0
45
Dec 20–26
0
0
75
Dec 27 – Jan 2
0
0
140
Reported as an adult
Only 2 records here are marked as adults, too few to show a adult season. One needs at least 20 records from 5 different years.
Reported as a larva
No records here are marked as larvae yet, so there is no larva season to show. One needs at least 20 records from 5 different years.
In Ohio
Mid-May to early November, middle week Aug 30 – Sep 5
Middle week · Aug 30 – Sep 5
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 1,908 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 944 dates. Latest record: December 2025.
Show as a table
Records of Bald-faced Hornet in Ohio each week, and records of all species
Week
Records of Bald-faced Hornet
Years recorded
Records of all species
Jan 4–10
5
4
6,211
Jan 11–17
6
4
5,146
Jan 18–24
3
1
4,645
Jan 25–31
5
4
4,698
Feb 1–7
1
1
6,023
Feb 8–14
6
3
5,888
Feb 15–21
1
1
5,436
Feb 22–28
4
2
6,846
Mar 1–7
3
3
8,321
Mar 8–14
3
3
10,384
Mar 15–21
7
4
12,620
Mar 22–28
3
3
13,949
Mar 29 – Apr 4
2
2
19,661
Apr 5–11
4
3
26,860
Apr 12–18
10
5
39,925
Apr 19–25
11
6
41,623
Apr 26 – May 2
13
7
56,391
May 3–9
24
6
52,952
May 10–16
15
5
53,785
May 17–23
21
7
57,698
May 24–30
23
7
54,651
May 31 – Jun 6
13
6
53,099
Jun 7–13
15
7
53,700
Jun 14–20
10
6
56,625
Jun 21–27
13
6
55,361
Jun 28 – Jul 4
19
5
58,477
Jul 5–11
30
8
61,336
Jul 12–18
50
7
64,722
Jul 19–25
66
9
69,753
Jul 26 – Aug 1
80
9
59,416
Aug 2–8
99
9
59,712
Aug 9–15
108
9
55,994
Aug 16–22
109
10
54,328
Aug 23–29
123
10
51,772
Aug 30 – Sep 5
133
9
57,167
Sep 6–12
159
10
59,075
Sep 13–19
141
10
54,543
Sep 20–26
103
8
45,860
Sep 27 – Oct 3
104
10
43,180
Oct 4–10
78
9
37,841
Oct 11–17
70
7
30,824
Oct 18–24
65
8
21,156
Oct 25–31
43
8
19,021
Nov 1–7
20
7
14,172
Nov 8–14
23
7
12,621
Nov 15–21
18
5
7,965
Nov 22–28
13
5
8,136
Nov 29 – Dec 5
4
3
6,083
Dec 6–12
5
4
6,004
Dec 13–19
8
4
5,423
Dec 20–26
6
5
5,661
Dec 27 – Jan 2
10
5
8,459
Reported as an adult
Usually reported as an adult mid-May to mid-October, middle week Aug 30 – Sep 5.
From 244 records that are marked as adults. Not every photo is marked with a life stage, so this shows when people reported it as an adult, not when adults are about.
Reported as a larva
No records here are marked as larvae yet, so there is no larva season to show. One needs at least 20 records from 5 different years.
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 Aerial YellowjacketDolichovespula arenaria109 identifications worldwide named one where the other was meant
Bald-faced Hornet FlySpilomyia fusca99 identifications worldwide named one where the other was meant
Northern Paper WaspPolistes fuscatus20 identifications worldwide named one where the other was meant
European HornetVespa crabro19 identifications worldwide named one where the other was meant
Fraternal Potter WaspEumenes fraternus19 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.
When each is reported
All recordsUsually mid-May to early November, middle week late August · 1,908 records
Reported as an adultUsually mid-May to mid-October, middle week late August · 244 records
Not every photo is marked with a sex or a sign, so these show when people reported each, not when it happens.
Land cover where it is recorded
Land cover
Its recordsAll Ohio records
Developed
71%49%
Forest
17%31%
Farmland
8%11%
Wetland
3%5%
Open water
0.7%3%
Barren
0.4%0.6%
Grassland and shrub
0.1%0.9%
From 1,106 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.
