When does chaparral pea bloom in California?

Most often in June. Across 1,092 dated, research-grade observations of Pickeringia montana in California, the flowering season runs roughly April to August.

Peak June In flower 1,092 Examined 1,242 State California

Flowering 1,092 in flower of 1,242 examined

39%

44%

76%

93%

96%

97%

85%

81%

56%

40%

31%

27%

Proportion of examined Pickeringia montana in California in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	7	18	39%	20% to 61%
Feb	12	27	44%	28% to 63%
Mar	68	89	76%	67% to 84%
Apr	182	196	93%	88% to 96%
May	411	426	96%	94% to 98%
Jun	257	264	97%	95% to 99%
Jul	99	116	85%	78% to 91%
Aug	25	31	81%	64% to 91%
Sep	15	27	56%	37% to 72%
Oct	8	20	40%	22% to 61%
Nov	4	13	31%	13% to 58%
Dec	4	15	27%	11% to 52%

Peak flowering in Jun. Each bar is the share of Pickeringia montana in California 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. 1,092 of 1,242 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 California found Pickeringia montana in flower, not a forecast. It is computed only from observations made in California, 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

Pickeringia montana

chaparral pea

Sourcesevery claim on this page

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