Saguaro National Park Trivia
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50 free Saguaro National Park trivia questions with answers — geography quiz, new questions added Aug 2026.
This Saguaro National Park trivia quiz covers the two-part park that brackets Tucson, Arizona, and the giant cactus it protects: a plant that takes decades to grow its first arm, can top 60 feet, weighs as much as a small car and blooms for a single night at a time. It ranges across the volcanic Tucson Mountains and the higher, wetter Rincon sky island, the Cactus Forest and Bajada loop drives, and the desert wildlife from Gila monsters and javelinas to the endangered long-nosed bat that pollinates the flowers. There is plenty of history too: the Hohokam and their 800-year-old petroglyphs at Signal Hill, the Spanish presidio, the copper miners and homesteaders, the University of Arizona scientists who wanted a cactus sanctuary, Herbert Hoover's 1933 monument, Kennedy's 1961 expansion, the CCC picnic shelters and Congress's 1994 upgrade to national park. Questions run from easy to expert with the difficulty shown on each one, so it works for a Tucson road-trip game or a serious park-nerd challenge. Every answer was checked against a reference page and each question carries its citation. If you enjoy it, try our Petrified Forest, Grand Canyon and US National Parks quizzes next.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Saguaro National Park is in which U.S. state?
Arizona
Saguaro National Park is in southern Arizona; its two districts lie on either side of the city of Tucson.
Q 02In which Arizona county do both districts of Saguaro National Park lie?
Pima
Both districts are in Pima County, whose seat is Tucson; the county's own Tucson Mountain Park adjoins the western district.
Q 03Which desert do both districts of the park preserve?
Sonoran
Both districts protect stretches of the Sonoran Desert, the only place on Earth where the saguaro cactus grows naturally.
Q 04Which president proclaimed Saguaro National Monument?
Herbert Hoover
Herbert Hoover proclaimed Saguaro National Monument on March 1, 1933, three days before leaving office, after lobbying by Tucson Citizen publisher and former Postmaster General Frank Hitchcock.
Q 05Which president added the Tucson Mountain District to Saguaro National Monument?
John F. Kennedy
John F. Kennedy's 1961 proclamation added the Tucson Mountain District, about 15,000 acres carved from Pima County's Tucson Mountain Park, urged on by Arizonan Interior Secretary Stewart Udall.
Q 06In what year did Congress make Saguaro a national park?
1994
Congress elevated Saguaro from national monument to national park in 1994; a later appropriations act added another 1,232 acres.
Q 07Roughly how many saguaros are estimated to grow in the park?
About 1.8 million
Park censuses have counted about 1.8 million to 1.9 million saguaros, alongside roughly two dozen other cactus species including fishhook barrel and teddybear cholla.
Q 08A saguaro typically grows its first arm at roughly what age?
50 to 70 years
A saguaro usually sprouts its first arm at 50 to 70 years of age; in the driest spots it can take closer to a century, and some never grow arms at all.
Q 09A fully hydrated mature saguaro can weigh up to about how much?
4,800 pounds
A fully hydrated adult saguaro can weigh 3,200 to 4,800 pounds; it soaks up rain, visibly swells, and lives off the stored water through drought.
Q 10Roughly how tall can a mature saguaro grow?
Up to 60 feet
Exceptional saguaros grow up to 60 feet tall, though most mature plants stand around 40 feet; it is the largest cactus in the United States, considered adult at about 125 years.
Q 11The saguaro's genus name honours which American industrialist?
Andrew Carnegie
The genus Carnegiea honours Andrew Carnegie, whose Carnegie Institution founded the Desert Laboratory in Tucson in 1903; the species name gigantea simply means giant.
Q 12In which year did Arizona adopt the saguaro blossom as its state flower?
1931
Arizona's legislature adopted the saguaro cactus blossom as the state flower in 1931; the white, waxy flowers open after sunset and close by the following afternoon.
Q 13Which migratory bat is the saguaro's main night-time pollinator, summering in the park?
Lesser long-nosed bat
The lesser long-nosed bat, delisted from the US endangered species list in 2018, laps saguaro nectar by night, leaving claw marks on the flowers; by day honey bees and white-winged doves take over.
Q 21Roughly how many Madrean Sky Island ranges step between the Rockies and Mexico's Sierra Madre?
About 40
About 40 forested ranges make up the Madrean Sky Islands, stepping stones across seas of low desert between the Rockies and the Sierra Madre; the Rincons are one of them.
Q 22'Rincon', as in the Rincon Mountains, is Spanish for what?
Corner
Rincón is Spanish for corner or nook; the range's name is said to describe the angled shape of its footprint.
Q 23Eruptions that formed the Tucson Mountains left a collapsed caldera roughly how wide?
12 miles
The Tucson Mountains caldera measured roughly 12 miles across; a granite remnant of its old magma chamber can be seen from the Sus Picnic Area.
Q 14Which birds excavate nest holes in saguaros that later shelter elf owls and other species?
Gila woodpeckers and gilded flickers
Gila woodpeckers and gilded flickers chisel nest holes into living saguaros; the cactus seals each wound with hard callus tissue, and elf owls and other birds reuse the cavities later.
Q 15In which months do saguaros mainly bloom?
May and June
Saguaros bloom from late April through May and June, each white flower opening at night and lasting less than a day; the fruit ripens in June and July.
Q 16The Tohono O'odham harvest saguaro fruit with a long pole made from what?
Two of its ribs tied together
The tool is called a kuibit, and the June harvest is boiled down into syrup, jam and ceremonial wine.
Q 17Which culture, living here between AD 200 and 1450, left petroglyphs and pottery in the park?
Hohokam
The Hohokam lived around Tucson from about AD 200 to 1450, farming corn, beans and squash and gathering cholla buds and saguaro fruit; their petroglyphs survive on boulders in the park.
Q 18Which short trail off the Bajada Loop Drive leads to dozens of 800-year-old petroglyphs?
Signal Hill
The half-mile Signal Hill Trail climbs to boulders pecked with Hohokam petroglyphs about 800 years old, in the Tucson Mountain District.
Q 19Which of the park's two ranges is higher, wetter and part of the Madrean Sky Islands?
The Rincons
The Rincons rise to 8,666 feet and carry pine and mixed conifer forest above the cactus belt, unlike the lower, drier Tucson Mountains.
Q 20What is the highest point in the park, at 8,666 feet?
Mica Mountain
Mica Mountain, at 8,666 feet in the Rincons, is the park's summit; Wasson Peak, at 4,687 feet, is the top of the Tucson Mountains.
Q 24Which low-angle fault carried rock from under the Tucson Mountains up to 22 miles east to form the park's eastern range?
Catalina
Movement on the Catalina detachment fault separated the Tucson Mountains from the rocks beneath them by some 22 miles, leaving the Rincons mostly banded Catalina gneiss with none of the west side's volcanic rock.
Q 25Which invasive African grass, first detected in the park in 1989, is its most serious plant threat?
Buffelgrass
Buffelgrass, imported from Africa in the 1930s as cattle forage, carries fire through the cactus forest; park crews and volunteers hand-pull it, though eradication is considered impossible.
Q 26Which Arizona state bird builds football-shaped nests among the park's chollas?
Cactus wren
The cactus wren, Arizona's state bird, weaves bulky football-shaped nests among cholla spines and often keeps several for roosting.
Q 27Which venomous lizard is native to the park's desert lowlands?
Gila monster
The Gila monster, one of the world's few venomous lizards, spends most of its life underground in the park's lowlands; western diamondback rattlesnakes are the most commonly seen snakes.
Q 28Which pig-like mammal, common in the park, is actually a peccary?
Javelina
Javelina, or collared peccaries, travel in herds through the park's washes and bajadas; despite the look they are not pigs but New World peccaries.
Q 29Which strikingly red bird, uncommon elsewhere in the U.S., breeds in the park?
Vermilion flycatcher
The vermilion flycatcher, a small flame-red bird of the desert Southwest, breeds along the park's washes; the threatened Mexican spotted owl nests in the Rincon high country.
Q 30Which park amphibian's tadpoles can become toadlets in little over a week?
Couch's spadefoot
Couch's spadefoot spends most of the year in a burrow, emerges with the summer monsoon to breed in temporary pools, and its tadpoles can transform in about nine days.