When does white clover bloom in Oregon?

Most often in June. Across 267 dated, research-grade observations of Trifolium repens in Oregon, the flowering season runs roughly May to October.

Peak June In flower 267 Examined 287 State Oregon

Flowering 267 in flower of 287 examined

58%

96%

99%

96%

89%

92%

93%

Proportion of examined Trifolium repens in Oregon in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	1	too few examined
Feb	0	0	too few examined
Mar	0	0	too few examined
Apr	11	19	58%	36% to 77%
May	90	94	96%	90% to 98%
Jun	76	77	99%	93% to 100%
Jul	44	46	96%	85% to 99%
Aug	17	19	89%	69% to 97%
Sep	12	13	92%	67% to 99%
Oct	13	14	93%	69% to 99%
Nov	3	3	too few examined
Dec	1	1	too few examined

Peak flowering in Jun. Each bar is the share of Trifolium 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. 267 of 287 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 5 months have fewer than 5 examined observations, so no proportion is drawn for them. 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 Trifolium 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

Trifolium repens

white clover

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.