When does Creeping buttercup bloom in Oregon?

Most often in June. Across 454 dated, research-grade observations of Ranunculus repens in Oregon, the flowering season runs roughly May to July.

Peak June In flower 454 Examined 624 State Oregon

Flowering 454 in flower of 624 examined

47%

91%

95%

89%

74%

29%

30%

11%

Proportion of examined Ranunculus repens in Oregon in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	1	13	8%	1% to 33%
Feb	1	12	8%	1% to 35%
Mar	3	34	9%	3% to 23%
Apr	35	74	47%	36% to 59%
May	221	242	91%	87% to 94%
Jun	122	128	95%	90% to 98%
Jul	49	55	89%	78% to 95%
Aug	14	19	74%	51% to 88%
Sep	4	14	29%	12% to 55%
Oct	3	10	30%	11% to 60%
Nov	1	9	11%	2% to 44%
Dec	0	14	0%	0% to 22%

Peak flowering in Jun. Each bar is the share of Ranunculus repens in Oregon observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 454 of 624 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.wt38fd.

What this is, and what it is not

This is a record of when people in Oregon found Ranunculus repens in flower, not a forecast. It is computed only from observations made in Oregon, so it is not the species’ global average dragged onto a map: the same plant flowers on different dates in different places, and that is the entire point of the page.

It will not tell you what your particular plant will do this year. Bloom time moves with the season, with altitude, and with the weather, and a warm February pulls everything forward. We publish the distribution and the sample size, and we refuse to draw a month that too few people examined.

The plant

Ranunculus repens

Creeping buttercup

Sourcesevery claim on this page

GBIF (iNaturalist Research-grade Observations). Dated flowering annotations in Oregon. Every record achieved iNaturalist quality grade Research, which is applied upstream at export. 10.15468/dl.wt38fd. Retrieved 2026-07-14.
World Flora Online Plant List. The accepted name. CC0. Retrieved 2026-07-12.