Snow trillium
Trillium nivale Riddell
Snow trillium in all of Ohio- Kingdom
- Plantae
- Phylum
- Tracheophyta
- Class
- Liliopsida
- Order
- Liliales
- Family
- Melanthiaceae
- Genus
- Trillium
Range
Where it is recorded
Season shown in 1 of Ohio's 88 counties. Explore Ohio
- No result yet (79)
- Recorded, too few records for a result (6)
- Recorded, season not shown (2)
- Season shown (1)
Counties as a table
| County | Records |
|---|---|
| Adams County | 42 · Season shown |
| Allen County | No qualifying records yet |
| Ashland County | No qualifying records yet |
| Ashtabula County | No qualifying records yet |
| Athens County | No qualifying records yet |
| Auglaize County | No qualifying records yet |
| Belmont County | No qualifying records yet |
| 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 | Recorded, too few records for a result |
| 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 | No qualifying records yet |
| Darke County | No qualifying records yet |
| Defiance County | No qualifying records yet |
| 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 | No qualifying records yet |
| Geauga County | No qualifying records yet |
| Greene County | 58 · Recorded, season not shown |
| Guernsey County | No qualifying records yet |
| Hamilton County | No qualifying records yet |
| 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 | 31 · Recorded, season not shown |
| Hocking County | No qualifying records yet |
| 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 | No qualifying records yet |
| Licking County | No qualifying records yet |
| Logan County | No qualifying records yet |
| Lorain County | No qualifying records yet |
| Lucas County | No qualifying records yet |
| Madison County | No qualifying records yet |
| Mahoning County | No qualifying records yet |
| 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 | No qualifying records yet |
| Pike County | No qualifying records yet |
| Portage County | No qualifying records yet |
| 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 | No qualifying records yet |
| Summit County | No qualifying records yet |
| Trumbull County | No qualifying records yet |
| Tuscarawas County | No qualifying records yet |
| Union County | No qualifying records yet |
| Van Wert County | No qualifying records yet |
| Vinton County | No qualifying records yet |
| Warren County | No qualifying records yet |
| 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 Greene County
Not enough evidence
Records per week from 58 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
| Week | Records of snow trillium | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 0 | 0 | 97 |
| Jan 11–17 | 0 | 0 | 49 |
| Jan 18–24 | 0 | 0 | 37 |
| Jan 25–31 | 0 | 0 | 55 |
| Feb 1–7 | 0 | 0 | 82 |
| Feb 8–14 | 0 | 0 | 90 |
| Feb 15–21 | 0 | 0 | 186 |
| Feb 22–28 | 0 | 0 | 151 |
| Mar 1–7 | 2 | 2 | 124 |
| Mar 8–14 | 1 | 1 | 238 |
| Mar 15–21 | 18 | 5 | 299 |
| Mar 22–28 | 16 | 7 | 338 |
| Mar 29 – Apr 4 | 13 | 4 | 561 |
| Apr 5–11 | 3 | 2 | 537 |
| Apr 12–18 | 1 | 1 | 738 |
| Apr 19–25 | 2 | 1 | 793 |
| Apr 26 – May 2 | 0 | 0 | 1,090 |
| May 3–9 | 0 | 0 | 778 |
| May 10–16 | 0 | 0 | 721 |
| May 17–23 | 1 | 1 | 889 |
| May 24–30 | 0 | 0 | 932 |
| May 31 – Jun 6 | 0 | 0 | 889 |
| Jun 7–13 | 1 | 1 | 1,186 |
| Jun 14–20 | 0 | 0 | 1,205 |
| Jun 21–27 | 0 | 0 | 1,059 |
| Jun 28 – Jul 4 | 0 | 0 | 1,150 |
| Jul 5–11 | 0 | 0 | 1,279 |
| Jul 12–18 | 0 | 0 | 1,164 |
| Jul 19–25 | 0 | 0 | 1,228 |
| Jul 26 – Aug 1 | 0 | 0 | 1,533 |
| Aug 2–8 | 0 | 0 | 1,324 |
| Aug 9–15 | 0 | 0 | 1,105 |
| Aug 16–22 | 0 | 0 | 957 |
| Aug 23–29 | 0 | 0 | 942 |
| Aug 30 – Sep 5 | 0 | 0 | 932 |
| Sep 6–12 | 0 | 0 | 992 |
| Sep 13–19 | 0 | 0 | 1,194 |
| Sep 20–26 | 0 | 0 | 870 |
| Sep 27 – Oct 3 | 0 | 0 | 677 |
| Oct 4–10 | 0 | 0 | 614 |
| Oct 11–17 | 0 | 0 | 533 |
| Oct 18–24 | 0 | 0 | 305 |
| Oct 25–31 | 0 | 0 | 307 |
| Nov 1–7 | 0 | 0 | 214 |
| Nov 8–14 | 0 | 0 | 227 |
| Nov 15–21 | 0 | 0 | 155 |
| Nov 22–28 | 0 | 0 | 110 |
| Nov 29 – Dec 5 | 0 | 0 | 86 |
| Dec 6–12 | 0 | 0 | 36 |
| Dec 13–19 | 0 | 0 | 46 |
| Dec 20–26 | 0 | 0 | 117 |
| Dec 27 – Jan 2 | 0 | 0 | 186 |
Reported in flower
Usually reported in flower early March to late March, middle week Mar 22–28.
From 34 records that show flowers. Not every photo of a plant in flower is marked as flowering, so this shows when people reported it in flower, not when it flowers.
Reported in fruit
Only 2 records here show fruit, too few to show a fruiting season. One needs at least 20 records from 5 different years.
In Ohio
Early March to mid-April, middle week Mar 22–28
Records per week from 284 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 116 dates. Latest record: April 2025.
Show as a table
| Week | Records of snow trillium | 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 | 0 | 0 | 5,888 |
| Feb 15–21 | 2 | 1 | 5,436 |
| Feb 22–28 | 6 | 3 | 6,846 |
| Mar 1–7 | 45 | 4 | 8,321 |
| Mar 8–14 | 22 | 9 | 10,384 |
| Mar 15–21 | 59 | 9 | 12,620 |
| Mar 22–28 | 62 | 9 | 13,949 |
| Mar 29 – Apr 4 | 48 | 7 | 19,661 |
| Apr 5–11 | 24 | 6 | 26,860 |
| Apr 12–18 | 7 | 5 | 39,925 |
| Apr 19–25 | 5 | 2 | 41,623 |
| Apr 26 – May 2 | 2 | 2 | 56,391 |
| May 3–9 | 0 | 0 | 52,952 |
| May 10–16 | 0 | 0 | 53,785 |
| May 17–23 | 1 | 1 | 57,698 |
| May 24–30 | 0 | 0 | 54,651 |
| May 31 – Jun 6 | 0 | 0 | 53,099 |
| Jun 7–13 | 1 | 1 | 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 | 0 | 0 | 69,753 |
| Jul 26 – Aug 1 | 0 | 0 | 59,416 |
| Aug 2–8 | 0 | 0 | 59,712 |
| Aug 9–15 | 0 | 0 | 55,994 |
| Aug 16–22 | 0 | 0 | 54,328 |
| Aug 23–29 | 0 | 0 | 51,772 |
| Aug 30 – Sep 5 | 0 | 0 | 57,167 |
| Sep 6–12 | 0 | 0 | 59,075 |
| Sep 13–19 | 0 | 0 | 54,543 |
| Sep 20–26 | 0 | 0 | 45,860 |
| Sep 27 – Oct 3 | 0 | 0 | 43,180 |
| Oct 4–10 | 0 | 0 | 37,841 |
| Oct 11–17 | 0 | 0 | 30,824 |
| Oct 18–24 | 0 | 0 | 21,156 |
| Oct 25–31 | 0 | 0 | 19,021 |
| Nov 1–7 | 0 | 0 | 14,172 |
| Nov 8–14 | 0 | 0 | 12,621 |
| Nov 15–21 | 0 | 0 | 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
Usually reported in flower early March to late March, middle week Mar 15–21.
From 195 records that show flowers. Not every photo of a plant in flower is marked as flowering, so this shows when people reported it in flower, not when it flowers.
Reported in fruit
Only 8 records here show fruit, too few to show a fruiting season. 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.
Relatives
In the same genus
Other Trillium recorded in Greene County
Identification
How to identify it
Often confused with
- large white trillium Trillium grandiflorum38 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: recorded
- Jul: no record
- Aug: no record
- Sep: no record
- Oct: no record
- Nov: no record
- Dec: no record
Not reported in Ohio in July to January, 2016 to 2025.
Time of day it is recorded
From 281 Ohio records with a time. Most records are made when people are outside, so night and early-morning species are under-recorded.
Land cover where it is recorded
| Land cover | Its recordsAll Ohio records |
|---|---|
| Forest | 85%31% |
| Developed | 14%49% |
| Farmland | 1%11% |
From 89 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
- See it on iNaturalist (opens in a new tab)OpenPhenology is independent and not affiliated with iNaturalist.
Records behind the Ohio result
284 records from 2 datasets.
- iNaturalist Research-grade Observations (opens in a new tab) · iNaturalist.org · 282 recordsiNaturalist contributors, iNaturalist (2026). iNaturalist Research-grade Observations. iNaturalist.org. Occurrence dataset https://doi.org/10.15468/ab3s5x accessed via GBIF.org on 2026-11-13.
- iNaturalist observations (opens in a new tab) · iNaturalist.org · 2 recordsiNaturalist. Available from https://www.inaturalist.org. Accessed 2026-11-13
To cite: the GBIF download doi:10.15468/dl.y2jkt8 (opens in a new tab).
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.