When does Salmonberry bloom in Washington?

Most often in April. Across 1,555 dated, research-grade observations of Rubus spectabilis in Washington, the flowering season runs roughly March to April.

Peak April In flower 1,555 Examined 2,666 State Washington

Flowering 1,555 in flower of 2,666 examined

15%

49%

92%

94%

48%

13%

12%

13%

Proportion of examined Rubus spectabilis in Washington in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	4	27	15%	6% to 32%
Feb	19	39	49%	34% to 64%
Mar	280	306	92%	88% to 94%
Apr	952	1008	94%	93% to 96%
May	211	436	48%	44% to 53%
Jun	63	488	13%	10% to 16%
Jul	22	191	12%	8% to 17%
Aug	1	69	1%	0% to 8%
Sep	0	30	0%	0% to 11%
Oct	0	27	0%	0% to 12%
Nov	0	21	0%	0% to 15%
Dec	3	24	13%	4% to 31%

Peak flowering in Apr. Each bar is the share of Rubus spectabilis in Washington 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. 1,555 of 2,666 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 Washington found Rubus spectabilis in flower, not a forecast. It is computed only from observations made in Washington, 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

Rubus spectabilis

Salmonberry

Sourcesevery claim on this page

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