What makes a superbloom
A superbloom isn't a mystery — it's an invoice the winter has to pay. Desert annuals sprout on soaking fall rain and keep going only if storms keep coming through February. That makes the outlook readable months early: watch the rain gauges at the deserts that put on the famous shows.
Is 2027 a superbloom year? → The rain to date at all four deserts, and where the season stands.
The picture firms up between December and February: by then the autumn storms have either come or they haven't, and the parks start posting what they are seeing on the ground. We report the gauges and what the agencies say — we don't call a superbloom, and neither do they until the flowers are up.
Death Valley
A big spring here has historically followed about 2.0" of rain across the season, and the famous ones came in at 3.0" or better.
The rarest show of them all. Furnace Creek sees about two inches of rain in an ordinary year, and the springs the park itself puts on the record — 1998, 2005, 2016, 2026 — each followed a soaking autumn rather than a merely wet winter. Death Valley counts its fall rain, September through November, and watches what the storms do after that.
Before you drive: the National Park Service keeps the park's own wildflower page — where the bloom stands, elevation by elevation, and the short list of springs it counts as superblooms.
Rain measured at the Death Valley (Furnace Creek) weather station (NOAA). Superblooms the agency has put on the record here: 1998, 2005, 2016, 2026.
Anza-Borrego
A big spring here has historically followed about 3.5" of rain across the season, and the famous ones came in at 5.5" or better.
The most reliable of the big desert blooms. Borrego Springs needs a few well-spaced winter storms; when the season tops about three and a half inches, the flats along Henderson Canyon Road usually deliver.
Before you drive: California State Parks keeps the park's dated wildflower updates, posted through the season. There's also Anza-Borrego Desert State Park visitor information.
Field reports: Bloom Reports from the Anza-Borrego Desert (Tom Chester) and Anza-Borrego Desert Wildflowers bloom report (Fred and Carla Melgert of Borrego Wildflowers).
Rain measured at the Borrego Desert Park weather station (NOAA). Superblooms the agency has put on the record here: 2005, 2017, 2019.
Antelope Valley
A big spring here has historically followed about 5.0" of rain across the season, and the famous ones came in at 8.0" or better.
Poppies are grass-country flowers, not true desert ones — the reserve needs a genuinely wet winter to go wall-to-wall orange, and a dry one leaves the hills mostly green-brown.
Before you drive: California State Parks keeps the reserve's park page — season dates, visitor center hours, and the number the reserve answers bloom questions on. There's also the reserve's live poppy cam.
Rain measured at the Lancaster (Fox Field) weather station (NOAA). Superblooms the agency has put on the record here: 2017, 2019.
Carrizo Plain
A big spring here has historically followed about 6.0" of rain across the season, and the famous ones came in at 9.0" or better.
The biggest canvas in California. The plain needs a truly wet year to run yellow border to border, and when it happens the bloom is visible from the Temblor ridge — and from orbit.
Before you drive: the Bureau of Land Management keeps the monument's visitor page — roads, seasons, and what is open. The BLM does not keep a running bloom status for the Carrizo Plain the way the other three parks do. It posts an announcement when the season opens, usually in February or March, and points callers at a recorded line.
Rain measured at the New Cuyama weather station (NOAA). Superblooms the agency has put on the record here: 2023, 2026.
What a superbloom actually is
There is no official definition, and the National Park Service says so plainly. Death Valley uses the word for the years when the flowers come up in swaths of color across the landscape instead of scattered plants you have to go looking for — and it reckons that happens roughly once a decade.
The conditions the park names are specific. Rain has to be well spaced through autumn, winter and spring rather than arriving all at once; a storm of about half an inch is needed just to wash the protective coating off the seeds so they can germinate at all. After that the seedlings need enough warmth, and they need the drying winds to stay away. The setup the park describes as ideal is an early autumn storm followed by an El Niño winter that keeps the rain coming.
California State Parks adds a second mechanism for the parks it manages: a wet winter lands hardest when it follows years of drought, because the drought has already cleared out the grasses and weeds that would otherwise crowd the wildflowers out. That is the pattern behind the 2017 and 2019 desert springs.
Sources: the Death Valley wildflower page (National Park Service) and the California State Parks desert bloom outlook .
How rare is it, really
Rare enough that the whole documented record fits in one paragraph. Counting only the springs an agency itself put on the record — the Park Service, California State Parks, the BLM — there have been 7 since 1998: 1998, 2005, 2016, 2017, 2019, 2023, 2026, the most recent in 2026. Several springs people remember as superblooms are not on that list, because nobody official ever called them one.
Every superbloom the parks have on the record, with sources →
Every spring, and what it came to
One page per spring, each with the winter rain behind it and whatever the agency that manages the ground said afterwards. A spring gets a page here once there is either a finished season at a desert we measure or an agency on the record about it — the springs further back than our station totals reach are on the record page instead.
- 2027 open The season that decides it opens October 1
- 2026 On the record at Death Valley and the Carrizo Plain
- 2025 Rain over the mark at the Carrizo Plain, and no agency call
- 2024 A winter the agencies declined to call a superbloom
- 2023 On the record at the Carrizo Plain
- 2022 Rain over the mark at the Carrizo Plain, and no agency call
- 2021 Under the big-year mark everywhere we measure
- 2020 Rain over the mark at Anza-Borrego, Antelope Valley and the Carrizo Plain, and no agency call
- 2019 On the record at Anza-Borrego, Antelope Valley and Ocotillo Wells State Vehicular Recreation Area
- 2017 On the record at Anza-Borrego, Antelope Valley and Ocotillo Wells State Vehicular Recreation Area
- 2016 On the record at Death Valley
- 2005 On the record at Death Valley and Anza-Borrego
- 1998 On the record at Death Valley
The flowers that make the show
- California poppies at the Antelope Valley Poppy Reserve — best late March into early April
- California poppies at Walker Canyon — best early March into early April
- Goldfields on the Carrizo Plain — best late March into mid-April
- Tidy tips on the Carrizo Plain — best late March into mid-April
- Desert gold in Death Valley — best late February into early March
- Desert gold in Anza-Borrego — best early March into late March
- Desert sand verbena in Anza-Borrego — best late February into late March
- Dune evening primrose in Anza-Borrego — best early March into late March
- Desert lilies in Anza-Borrego — best late February into mid-March
Where the dated answer lives
This page holds still: what a superbloom is, what each desert needs, and the way in to every spring. The season's own numbers sit on the 2027 page, which moves as the winter does. The rain year runs October 1 to May 31 and the station totals are refreshed through it — most usefully from December, once there is enough of a season to read. The parks work to their own rhythm: Death Valley posts bloom news from around December through March, California State Parks publishes a desert outlook between late January and early March and then keeps Anza-Borrego's updates running through the spring, and the BLM announces the Carrizo Plain season in February or March.
What won't change is the posture. We report what the gauges measured and what the agencies said, and we leave the word itself to them — the Park Service declined to call a superbloom in the middle of a record wet autumn, and if the park that owns the flowers won't run ahead of them, neither will we.
Rain-year totals from NOAA station records. Bloom status belongs to the parks: Death Valley · Anza-Borrego · Antelope Valley · Carrizo Plain