When does American trumpet vine bloom in Mississippi?

Most often in July. Across 193 dated, research-grade observations of Campsis radicans in Mississippi, the flowering season runs roughly June to September.

Peak July In flower 193 Examined 393 State Mississippi

Flowering 193 in flower of 393 examined

14%

51%

68%

69%

52%

55%

17%

Proportion of examined Campsis radicans in Mississippi in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	7	0%	0% to 35%
Feb	0	1	too few examined
Mar	1	7	14%	3% to 51%
Apr	2	25	8%	2% to 25%
May	37	73	51%	39% to 62%
Jun	53	78	68%	57% to 77%
Jul	49	71	69%	58% to 79%
Aug	26	50	52%	39% to 65%
Sep	21	38	55%	40% to 70%
Oct	4	24	17%	7% to 36%
Nov	0	11	0%	0% to 26%
Dec	0	8	0%	0% to 32%

Peak flowering in Jul. Each bar is the share of Campsis radicans in Mississippi 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. 193 of 393 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 Mississippi found Campsis radicans in flower, not a forecast. It is computed only from observations made in Mississippi, 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

Campsis radicans

American trumpet vine

Sourcesevery claim on this page

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