Introduced and assessed as invasive in the lower 48 states
iNaturalist's volunteer curators list it as introduced in their Ohio checklist.
US-RIIS assesses a species as invasive when it causes, or is likely to cause, harm there, or is at least locally abundant and harmful ecologically, economically, or to health.
Recorded in 27 of Ohio's 88 counties, with too few records in each for a result.
No result yet (61)
Recorded, too few records for a result (27)
Recorded, season not shown (0)
Season shown (0)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Show as a table
Counties as a table
red-seeded dandelion by Ohio county: records and mapped range
County
Records
Adams County
No qualifying records yet
Allen County
No qualifying records yet
Ashland County
Recorded, too few records for a result
Ashtabula County
Recorded, too few records for a result
Athens County
No qualifying records yet
Auglaize County
No qualifying records yet
Belmont County
Recorded, too few records for a result
Brown County
No qualifying records yet
Butler County
Recorded, too few records for a result
Carroll County
No qualifying records yet
Champaign County
No qualifying records yet
Clark County
No qualifying records yet
Clermont County
No qualifying records yet
Clinton County
No qualifying records yet
Columbiana County
No qualifying records yet
Coshocton County
No qualifying records yet
Crawford County
No qualifying records yet
Cuyahoga County
Recorded, too few records for a result
Darke County
No qualifying records yet
Defiance County
Recorded, too few records for a result
Delaware County
Recorded, too few records for a result
Erie County
No qualifying records yet
Fairfield County
No qualifying records yet
Fayette County
No qualifying records yet
Franklin County
Recorded, too few records for a result
Fulton County
No qualifying records yet
Gallia County
Recorded, too few records for a result
Geauga County
Recorded, too few records for a result
Greene County
Recorded, too few records for a result
Guernsey County
No qualifying records yet
Hamilton County
Recorded, too few records for a result
Hancock County
No qualifying records yet
Hardin County
No qualifying records yet
Harrison County
No qualifying records yet
Henry County
No qualifying records yet
Highland County
No qualifying records yet
Hocking County
Recorded, too few records for a result
Holmes County
No qualifying records yet
Huron County
No qualifying records yet
Jackson County
No qualifying records yet
Jefferson County
No qualifying records yet
Knox County
No qualifying records yet
Lake County
No qualifying records yet
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
Recorded, too few records for a result
Lucas County
Recorded, too few records for a result
Madison County
No qualifying records yet
Mahoning County
Recorded, too few records for a result
Marion County
No qualifying records yet
Medina County
No qualifying records yet
Meigs County
No qualifying records yet
Mercer County
No qualifying records yet
Miami County
Recorded, too few records for a result
Monroe County
No qualifying records yet
Montgomery County
Recorded, too few records for a result
Morgan County
No qualifying records yet
Morrow County
No qualifying records yet
Muskingum County
No qualifying records yet
Noble County
No qualifying records yet
Ottawa County
No qualifying records yet
Paulding County
No qualifying records yet
Perry County
No qualifying records yet
Pickaway County
Recorded, too few records for a result
Pike County
Recorded, too few records for a result
Portage County
Recorded, too few records for a result
Preble County
No qualifying records yet
Putnam County
No qualifying records yet
Richland County
No qualifying records yet
Ross County
No qualifying records yet
Sandusky County
No qualifying records yet
Scioto County
No qualifying records yet
Seneca County
No qualifying records yet
Shelby County
No qualifying records yet
Stark County
Recorded, too few records for a result
Summit County
Recorded, too few records for a result
Trumbull County
No qualifying records yet
Tuscarawas County
Recorded, too few records for a result
Union County
No qualifying records yet
Van Wert County
No qualifying records yet
Vinton County
No qualifying records yet
Warren County
Recorded, too few records for a result
Washington County
No qualifying records yet
Wayne County
No qualifying records yet
Williams County
No qualifying records yet
Wood County
No qualifying records yet
Wyandot County
No qualifying records yet
No mapped range from the range source used, the USGS Gap Analysis Project, which maps land vertebrates only.
Season
When it is recorded
In Ohio
Early April to mid-October, middle week May 3–9
Middle week · May 3–9
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 81 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 72 dates. Latest record: May 2025.
Show as a table
Records of red-seeded dandelion in Ohio each week, and records of all species
Week
Records of red-seeded dandelion
Years recorded
Records of all species
Jan 4–10
0
0
6,211
Jan 11–17
0
0
5,146
Jan 18–24
0
0
4,645
Jan 25–31
0
0
4,698
Feb 1–7
0
0
6,023
Feb 8–14
1
1
5,888
Feb 15–21
0
0
5,436
Feb 22–28
0
0
6,846
Mar 1–7
0
0
8,321
Mar 8–14
0
0
10,384
Mar 15–21
0
0
12,620
Mar 22–28
2
2
13,949
Mar 29 – Apr 4
1
1
19,661
Apr 5–11
5
3
26,860
Apr 12–18
12
4
39,925
Apr 19–25
6
3
41,623
Apr 26 – May 2
12
6
56,391
May 3–9
5
3
52,952
May 10–16
6
4
53,785
May 17–23
5
4
57,698
May 24–30
3
3
54,651
May 31 – Jun 6
0
0
53,099
Jun 7–13
0
0
53,700
Jun 14–20
0
0
56,625
Jun 21–27
0
0
55,361
Jun 28 – Jul 4
0
0
58,477
Jul 5–11
0
0
61,336
Jul 12–18
0
0
64,722
Jul 19–25
1
1
69,753
Jul 26 – Aug 1
1
1
59,416
Aug 2–8
0
0
59,712
Aug 9–15
0
0
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
0
0
54,543
Sep 20–26
2
2
45,860
Sep 27 – Oct 3
2
2
43,180
Oct 4–10
3
3
37,841
Oct 11–17
3
2
30,824
Oct 18–24
3
2
21,156
Oct 25–31
2
2
19,021
Nov 1–7
0
0
14,172
Nov 8–14
1
1
12,621
Nov 15–21
1
1
7,965
Nov 22–28
0
0
8,136
Nov 29 – Dec 5
0
0
6,083
Dec 6–12
0
0
6,004
Dec 13–19
0
0
5,423
Dec 20–26
0
0
5,661
Dec 27 – Jan 2
0
0
8,459
Reported in flower
No flowering season shown here. Most records come from a single year, so a season is not shown yet.
Reported in fruit
No fruiting season shown here. Recorded in two separate seasons, so one season would put its middle week in the gap.
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.
common dandelionTaraxacum officinaleOften confused in Ohio: 66 identifications in Ohio named one where the other was meant
Common Sow-thistleSonchus oleraceus33 identifications worldwide named one where the other was meant
Common Cat's-earHypochaeris radicata32 identifications worldwide named one where the other was meant
Yellow SalsifyTragopogon dubius14 identifications worldwide named one where the other was meant
prickly sowthistleSonchus asper13 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.
Months not reported
Jan: no record
Feb: recorded
Mar: recorded
Apr: recorded
May: recorded
Jun: no record
Jul: recorded
Aug: recorded
Sep: recorded
Oct: recorded
Nov: recorded
Dec: no record
Not reported in Ohio in June and December to January, 2016 to 2025.
Land cover where it is recorded
Land cover
Its recordsAll Ohio records
Developed
93%49%
Forest
7%31%
From 55 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.
