When does Brazos rain-lily bloom in Texas?

Most often in May. Across 1,403 dated, research-grade observations of Zephyranthes chlorosolen in Texas, the flowering season runs roughly April to November.

Peak May In flower 1,403 Examined 1,437 State Texas

Flowering 1,403 in flower of 1,437 examined

95%

100%

97%

99%

100%

98%

95%

91%

Proportion of examined Zephyranthes chlorosolen in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	4	4	too few examined
Feb	0	0	too few examined
Mar	1	1	too few examined
Apr	109	115	95%	89% to 98%
May	86	86	100%	96% to 100%
Jun	91	94	97%	91% to 99%
Jul	122	123	99%	96% to 100%
Aug	364	365	100%	98% to 100%
Sep	419	429	98%	96% to 99%
Oct	161	169	95%	91% to 98%
Nov	43	47	91%	80% to 97%
Dec	3	4	too few examined

Peak flowering in May. Each bar is the share of Zephyranthes chlorosolen in Texas 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. 1,403 of 1,437 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 4 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 Texas found Zephyranthes chlorosolen in flower, not a forecast. It is computed only from observations made in Texas, 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

Zephyranthes chlorosolen

Brazos rain-lily

Sourcesevery claim on this page

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