When does Balkan Toadflax bloom in Colorado?

Most often in July. Across 147 dated, research-grade observations of Linaria dalmatica in Colorado, the flowering season runs roughly June to September.

Peak July In flower 147 Examined 236 State Colorado

Flowering 147 in flower of 236 examined

61%

90%

100%

90%

93%

62%

17%

Proportion of examined Linaria dalmatica in Colorado in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	1	too few examined
Feb	0	5	0%	0% to 43%
Mar	0	15	0%	0% to 20%
Apr	0	19	0%	0% to 17%
May	27	44	61%	47% to 74%
Jun	36	40	90%	77% to 96%
Jul	18	18	100%	82% to 100%
Aug	9	10	90%	60% to 98%
Sep	40	43	93%	81% to 98%
Oct	16	26	62%	43% to 78%
Nov	1	6	17%	3% to 56%
Dec	0	9	0%	0% to 30%

Peak flowering in Jul. Each bar is the share of Linaria dalmatica in Colorado 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. 147 of 236 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. One month has fewer than 5 examined observations, so no proportion is drawn for it. 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 Colorado found Linaria dalmatica in flower, not a forecast. It is computed only from observations made in Colorado, 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

Linaria dalmatica

Balkan Toadflax

Sourcesevery claim on this page

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