When does striped wintergreen bloom in Massachusetts?

Most often in July. Across 610 dated, research-grade observations of Chimaphila maculata in Massachusetts, the flowering season runs roughly July.

Peak July In flower 610 Examined 1,619 State Massachusetts

Flowering 610 in flower of 1,619 examined

10%

11%

80%

Proportion of examined Chimaphila maculata in Massachusetts in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	2	31	6%	2% to 21%
Feb	1	10	10%	2% to 40%
Mar	0	42	0%	0% to 8%
Apr	0	83	0%	0% to 4%
May	1	93	1%	0% to 6%
Jun	28	249	11%	8% to 16%
Jul	575	716	80%	77% to 83%
Aug	3	120	3%	1% to 7%
Sep	0	93	0%	0% to 4%
Oct	0	111	0%	0% to 3%
Nov	0	43	0%	0% to 8%
Dec	0	28	0%	0% to 12%

Peak flowering in Jul. Each bar is the share of Chimaphila maculata in Massachusetts 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. 610 of 1,619 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 Massachusetts found Chimaphila maculata in flower, not a forecast. It is computed only from observations made in Massachusetts, 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

Chimaphila maculata

striped wintergreen

Sourcesevery claim on this page

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