When does Red Clover bloom in Maine?

Most often in June. Across 183 dated, research-grade observations of Trifolium pratense in Maine, the flowering season runs roughly May to October.

Peak June In flower 183 Examined 189 State Maine

Flowering 183 in flower of 189 examined

88%

100%

86%

100%

Proportion of examined Trifolium pratense in Maine in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	0	too few examined
Mar	0	0	too few examined
Apr	0	0	too few examined
May	15	17	88%	66% to 97%
Jun	50	50	100%	93% to 100%
Jul	31	31	100%	89% to 100%
Aug	41	41	100%	91% to 100%
Sep	25	29	86%	69% to 95%
Oct	20	20	100%	84% to 100%
Nov	1	1	too few examined
Dec	0	0	too few examined

Peak flowering in Jun. Each bar is the share of Trifolium pratense in Maine 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. 183 of 189 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 6 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 Maine found Trifolium pratense in flower, not a forecast. It is computed only from observations made in Maine, 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 pratense

Red Clover

Sourcesevery claim on this page

GBIF (iNaturalist Research-grade Observations). Dated flowering annotations in Maine. 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.