What to look for in nature in Arizona this April

April is the changeover month. Saguaro National Park’s own conditions page says the spring annuals peak in March and early April, with the west side of Tucson blooming first, and that by late April the cactus flowers (cholla, prickly pear, hedgehog and saguaro) take over in both districts. The park’s flower page calls the first week of May the time when the greatest number of species is in bloom, and adds that saguaros are often in peak flower toward the end of May. Arizona State Parks gives the saguaro bloom as usually May and June. Put those together and the saguaro is a May story that starts with buds in April, while the shrubs and smaller cacti are the April story. Timing shifts with winter rain and spring warmth, so treat every window as an estimate.

The March guide covers the poppy and lupine peak that comes before this one. Do not pick or trample the blooms, and use the official pullouts instead of parking on roadsides, as the park asks. For a quick comparison across a month, visit the same trail in the first and last weeks of April and note which species have faded and which have opened; the national park’s west side tends to bloom before its east side, and higher, cooler ground trails the low desert by weeks.

Songbird migration is at full tide in the Sky Islands and along the river corridors. Tucson Bird Alliance’s spring 2025 almanac points to the top of Mount Lemmon in the Santa Catalina Mountains as a place where, during spring migration, species more common in Mexico (Red-faced, Olive and Grace’s Warblers and Painted Redstart) mix with other western warblers. It adds that resident Black-throated Gray, Virginia’s and Yellow-rumped Warblers forage beside migrants such as Wilson’s, Townsend’s, Hermit and MacGillivray’s on the gravel roads in April and May. Its advice is to go during migration rather than any random week, and the exact seasonal timing changes from year to year.

For the days you cannot travel, Journey North’s hummingbird reports and Nature’s Notebook (both linked below) are ways to follow the wave from home.

Southeastern Arizona is a hummingbird hotspot, and April is when the numbers begin to build. Tucson Bird Alliance says the number and variety of hummingbirds really picks up in April at its Paton Center for Hummingbirds in Patagonia, one of the few places in the country where seeing 11 species in a day is possible and a Violet-crowned Hummingbird is a sure thing. The Nature Conservancy lists April through September as the best months for birding at Ramsey Canyon Preserve, and Costa’s Hummingbirds, which nest here in late winter and spring, are already well into their season.

The desert is full of nests right now, and most of them are tucked where you would never look. The three stories below are all things you can watch without disturbing anything.

Yes. The research at Tonto National Monument, east of Phoenix, found Gila monsters leaving their hibernation sites from late March, with activity peaking in early April. In that study, 55 percent of the animals people met moved under cover, ran off or dug deeper rather than staying put, so they are far from aggressive. Researchers also recorded them eating a clutch of Gambel’s quail eggs and young desert cottontails.

See the safety notes below for what to do on the trail.

April is the month the low desert tips toward summer while the high country is still holding on to winter. The NOAA 1991–2020 normals in the table put Phoenix Sky Harbor at 85.5 °F for the average high and 60.8 °F for the low, Yuma Proving Ground at 86.1 °F and 58.5 °F, and Tucson at 82.9 °F and 53.3 °F, each with a quarter inch of rain or less. On the plateau the normal low at Flagstaff Pulliam is 28.2 °F, and its April snow normal is 5.0 inches; the Grand Canyon NP 2 station records 2.8 inches, Show Low 1.6 inches, and Payson 2.0 inches. In other words, freezing mornings and spring snow are still part of the picture above about 5,000 feet.

The National Weather Service in Phoenix lists the average first 90 °F day at Sky Harbor (1991–2020) as March 30, the average first 100 °F day as May 2, and the average first 105 °F day as May 22. The earliest 100 °F day on record there is March 26, 1988, and the earliest 105 °F day is April 20, 1989. So April in Phoenix is usually the last month before triple digits, not a guarantee.

The in-between towns show how much elevation matters. Willcox, in the Sulphur Springs Valley, has a normal high of 78.7 °F but a normal low of only 41.6 °F, and Show Low’s normals are 64.9 °F and 36.8 °F. Willcox swings about 37 degrees between its normal high and low, and Show Low about 28, which is why a Tucson-area hiker in shorts at noon can need a jacket at sunrise on the same trip. The normals describe an average April; individual days vary widely, and a spring storm can bring a late snowfall to Flagstaff or the White Mountains while Phoenix is warm. Check the National Weather Service forecast the day before any outing, and remember that the table lists each station under the exact name NOAA gives it, so the Grand Canyon figure comes from the station named Grand Canyon NP 2, which NCEI places on the South Rim at about 6,800 feet, not in the much warmer inner canyon.

The latest NOAA three-month outlook, updated each month, is posted at cpc.ncep.noaa.gov. Look up your own town on the Arizona frost dates page and read our weather guide, and for what the sky is doing see the cloud guide.

Arizona’s last freeze is spread across half the year. The table below shows the NOAA 1991–2020 dates for eight main stations. The Yuma, Phoenix and Tucson stations finish with freezes by January to early March, so April rarely brings frost there. The middle elevations are the ones to watch: the table has Kingman’s median at April 2, Sierra Vista’s at April 5 and Prescott’s at April 30. On the plateau the median is much later: June 4 at Flagstaff, in the table, and later still in the high country. If you garden at elevation, a warm April spell is not permission to plant tender things.

Check your own town on the Arizona frost dates page.

An azfamily weather report, using Iowa State University’s Environmental Mesonet records going back to 1948, says April is typically the windiest month in Flagstaff, Show Low and Tucson, and that Phoenix is less clear-cut because sources disagree. The cause is the spring tug-of-war between cool and warm air masses. Wind plus dry vegetation is why forests begin their fire-restriction watch now. On the Kaibab National Forest, weekly conference calls among national forests, parks, tribal fire units, state agencies and the National Weather Service run from April through August to decide on restrictions. Stage 1 restrictions generally prohibit campfires and charcoal outside developed sites with provided fire rings, limit smoking to enclosed vehicles, developed sites or cleared areas, and the forest says fireworks and exploding targets are never allowed.

Restrictions start on different dates in different forests and can come with little notice, so check the forest’s page the week you go. The National Weather Service in Flagstaff posts fire weather and red flag information; links are in the sources. Blowing dust can cut visibility on highways with little warning, so slow down, turn on your lights and avoid stopping in a travel lane if you cannot see. On hikes, wind makes it feel colder and dries you out faster than the thermometer suggests, and wind is the reason a spark from a chain, a cigarette or a vehicle in dry grass can spread quickly.

Arizona gains close to two minutes of daylight a day this month, between about 52 and 65 minutes over the whole month depending on the town. Below, eight towns are compared on April 1 and April 30, sunrise to sunset. Arizona does not change its clocks (the Navajo Nation does), so the gain is all you see in the evenings.

Compare with the daylight guide for your own town.

The Moon is new on April 6, full on April 20 (the Pink Moon, named for the pink spring flowers called moss pink) and the table uses Arizona time, Mountain Standard Time all year (the Navajo Nation, which observes daylight time, is an hour ahead). International Dark Sky Week is timed to the week of the April new moon, so check DarkSky International for the official 2027 dates. The dark mornings around the new moon are good for the Milky Way core before dawn: our own calculation (made for 30 degrees north, near southern Arizona) in the early part of April and in its final days, with about two hours of dark core sky.

• Lyrids, a poor year. The shower runs through the later weeks of April and peaks on the night of April 22 to 23, but the Moon, about 95 percent illuminated and only three days past full, climbs over Phoenix’s horizon near 9:22 p.m. That leaves just the early evening dark. Sea and Sky puts the peak rate near 20 an hour under ideal skies and warns that moonlight will erase the fainter streaks.
• Venus before dawn. The brilliant morning star clears the horizon roughly 75 minutes ahead of sunrise at the start of April and about 60 minutes ahead by May 1. A thin old crescent Moon sits close by on April 3 and 4 by our calculation.
• Mercury fades. It rises about 42 minutes before sunrise on April 1 and only about 22 minutes on April 15, so the morning chance is brief.
• Jupiter and Mars in the evening. Jupiter stays up into the small hours, and the Moon passes beside it on the evenings of April 14 and 15, within about a degree at their closest by our own calculation. Mars is nearby, about 3 degrees from the Moon on April 15 (also our calculation).
• Saturn. The ringed planet is behind the Sun on April 7 and reappears before dawn in the last days of the month.

See the moon phases guide for other months. The Eta Aquariids, an excellent shower at the May 6 new moon, come just after this month ends. A practical plan for a Pink Moon outing is to catch the Moon as it clears the eastern horizon on April 20 and then to leave the lights off for a while on the nights before and after, when the Moon is lower and the sky is better for the planets.

1. Verde Valley Birding and Nature Festival, April 22 to 25. Friends of the Verde River list these dates for 2027 at Dead Horse Ranch State Park in Cottonwood, with Family Nature Day on Saturday, April 24, from 10 a.m. to 3 p.m. Registration questions go to the organizer at 928-282-2202.
2. Bird walks at Catalina State Park. The state parks listing shows 7 a.m. walks on Sundays and Wednesdays in April, plus Mondays April 5 and 19, three to four hours each, through May 17. Check the page for changes.
3. Tucson Bird Count. The count’s own page says it takes place between April 15 and May 15 each year, with volunteers choosing one morning and making five-minute counts at each stop along an adopted route. Check with the count coordinator for 2027 details.
4. Earth Day, April 22, and Arbor Day. Earth Day is April 22. Arizona law names the last Friday in April as Arbor Day, which is April 30 in 2027, and it is not a legal holiday.
5. City Nature Challenge. The organizers list four observation days, April 30 to May 3, 2027, then identification until May 16. Families can join with a phone camera on any walk.
6. Havasu National Wildlife Refuge tours. Monthly guided outings, listed for the second Tuesday of each month during the November to April season, in the morning for two hours, in the morning, need a reservation at 928-259-9632.
7. Pink Moon evening. Take a flashlight and a jacket to a desert park after the Moon rises on April 20, and look for the Moon near Jupiter the week before.
8. Join a count. Log birds from your yard, report hummingbirds to Journey North, or record the bloom with Nature’s Notebook. It is free.

Browse other states at the nature hub and record what you see in the Naturalist’s Field Journal. Every date above came from the organizer’s own page when we checked in October 2026; please confirm by phone or online before leaving home.

• Spring turkey. The Game and Fish Department’s 2027 spring booklet lists shotgun and archery turkey hunts that are by draw permit. Youth-only Merriam’s hunts run April 16 to 22 and again May 7 to 20 in listed units. Most permit hunts run April 23 to 29 and May 7 to 20, or April 30 to May 20, while permit hunts for Gould’s turkey in units 29 and 30A begin April 30 and run into late May, and an archery-only Gould’s hunt in Unit 33 opens April 16. The limit is one turkey per calendar year. Expect hunters in forest at dawn.
• Spring bear. The booklet lists a general bear season March 19 to April 22 in many of the units it names, with a nonpermit tag, and cubs and females with cubs are off limits. Hunters must report within 48 hours.
• Orange and color. Arizona’s hunter safety course says hunter orange is not required but may be a good idea. On forest trails, choose bright clothing, and outfit a dog in a vividly colored vest.
• Snakes. Keep to trails and leashed dogs, check the ground before you reach or step, and detour around any snake you see. If bitten, call 911 and get to a hospital; Arizona’s poison center is at 800-222-1222.
• Bighorn rules. At Pusch Ridge Wilderness north of Tucson, the Forest Service forbids leaving system trails by more than 400 feet through April 30 for the sheep’s lambing season, and dogs may not enter the bighorn management area in any season.
• Refuges. Visiting Cabeza Prieta National Wildlife Refuge takes a Goldwater Range access permit, and the refuge has had fawning-season closures; confirm the current rules with the refuge.
• Warmth in the low desert. Where normal highs top 85 °F in Phoenix and Yuma, start hikes at dawn, carry far more water than you expect to need and turn back early.
• Cold above 5,000 feet. A normal low of 28 °F at Grand Canyon and Flagstaff means ice on shaded trails. Check road and trail conditions with the park at 928-638-7496 before you go.
• Wind, dust and fire. Slow down if dust reduces visibility, and follow the forest’s fire restrictions. Never leave a campfire unattended.