What to look for in nature in Iowa this April

April is the month the forest floor puts on its show. Spring ephemerals race through bloom before the canopy closes, so a trail that looked bare on April 1 can be carpeted three weeks later. The Iowa DNR publishes a weekly Woodland Wildflowers report through the season, split into northern, central, southern and western Iowa, and its 2026 series ended with a report dated May 18 and 19. Those reports are the best guide to what is open right now, and you can subscribe by email from the DNR page.

To show how the sequence runs, here is what the DNR's southern Iowa reports described in 2025, as relayed by KCII Radio. On April 19 the list included bloodroot, common blue violet, Dutchman's breeches, rue anemone, spring beauty, Virginia bluebells and sharp-lobed hepatica, with spring beauty and Dutchman's breeches at peak in Henry County and the first trout lilies just opening. A week later the same reports described valley floors covered in Virginia bluebells in Henry and Des Moines counties, with wild geranium and prairie trillium joining in. By May 3 the large-flowered bellwort and late Dutchman's breeches were nearly done and wild geranium was new. Treat the dates as one year's example, because a cold April pushes everything back.

The table above is the frost side of the same story. Each row gives the last 32 °F night of spring in the 30-year station record. At these stations the median falls between April 15 at Burlington and May 3 at Mason City and Decorah, and the late column, the date nine springs in ten beat, runs from May 1 at Burlington to May 16 at Decorah. Gardeners should treat the median as the earliest date to set out frost-tender plants, and the late column is the safer one. Look up your own town on the Iowa frost page.

April moves quickly. The Audubon Society of Omaha, whose calendar covers the Missouri Valley in southwest Iowa, breaks the month into weeks. Early April brings purple martins, tree swallows, hermit thrushes and a run of sparrows (chipping, field, savannah and fox). By mid-month the list adds Franklin's gulls, Swainson's hawks in large numbers, shorebirds such as yellowlegs and willets, brown thrashers, yellow-rumped warblers, and vesper, lark and grasshopper sparrows. The last third of April brings upland, spotted, solitary and least sandpipers, eastern kingbirds, bank swallows, blue-gray gnatcatchers, and the first orange-crowned, black-and-white and northern parula warblers. Woodcock and ruby-crowned kinglets stay through the month. That calendar belongs to the Omaha area, so treat its weeks as a guide and expect them to shift across the state with the weather. The main wave of warblers waits for May: the Iowa Natural Heritage Foundation puts the warblers' arrival at late April or early May.

Write the date beside each first arrival in the Naturalist's Field Journal; after two or three springs you will have a personal arrival calendar.

The DNR's frog and toad call page says Iowa has 16 species and gives an approximate start for each, with the warning that timing varies with the weather and your place in the state. The boreal chorus frog, whose call is likened to running a finger along a fine-toothed comb, starts in March or April. Plains leopard frogs, with a rhythmic, slightly rubbery chuck, and spring peepers, which sound like baby chicks, usually start in April. American toads, with a long, high trill, begin near the end of April to early May. Woodhouse's and Fowler's toads and Cope's gray treefrogs follow in May. April is therefore the month you can hear the changeover from the first thin chorus to a pond with several voices.

A pond that is silent on an April night is not necessarily empty. The DNR says its timing for each species varies with the year's weather and your place in the state, so come back on the next mild, damp evening.

Fish follow warming water the way birds follow insects. According to the DNR, spawning starts at water temperatures of 42 to 54 degrees, normally in early April here, and the females move into the shallows at night with several males. The fish are not feeding much during the spawn, so catching one is harder, so watching is often better than fishing.

The DNR's trout page has a map and the stocking calendar, and walleye and paddlefish rules are on its fishing pages.

Spring turkey hunting is a major April activity in Iowa's woods, and it affects how every other visitor should plan a walk. The Iowa DNR's 2027 dates are these. Youth hunters, residents only, get April 9 to 11 to themselves; season 1, April 12 to 15; season 2, April 16 to 20; season 3, April 21 to 27; and season 4, April 28 to May 16. Archery-only licenses run April 12 to May 16. Gun hunters may shoot from 30 minutes before sunrise to sunset. The bag limit is one bearded or male turkey for each license and tag. The DNR's 2025 preview noted a record harvest of more than 16,000 birds in 2024 and that historically only about one hunter in five tags a bird. Hunters need a license, the habitat fee and a turkey permit, and harvest must be reported by midnight the following day.

If you are not hunting, dress in bright colors in the woods until the seasons end, and leave red, white and blue clothing at home, since those are a tom's colors. See the safety section for the orange rules.

The Iowa DNR's guide to spotting morels says to start looking in early April and keep going through mid-May. The season depends on the weather. The DNR says to begin when soil reaches 53 degrees, and that daytime temperatures in the 60s with nights in the 50s improve the odds. Its field signs are lilacs budding and ready to flower, oak leaves the size of squirrel ears, open mayapple leaves, and other woodland wildflowers in bloom. The DNR gives no calendar date for any year, and neither do we.

Ask permission before looking for mushrooms on private land, and check county park rules first.

Iowa State University Extension gives dates for the showy spring trees: redbud flowers appear from mid-April to early May, before the leaves, serviceberry has white flowers in mid to late April, and magnolias bloom in mid to late April, and Extension adds that the saucer magnolia does best in southern Iowa. The DNR's morel guide gives a bud-stage clock for oaks, whose leaves look like squirrel ears when morels start.

Arbor Day in Iowa is set by law: the last Friday in April, with the week it falls in observed as Arbor Week, and the governor issues a proclamation each year. In 2027 that is Friday, April 30.

The "a tree through the seasons" plate in the Naturalist's Field Journal works well here: draw one branch with its buds on April 1 and again on April 30.

April is warmer and wetter than March, and more erratic than almost any other month. On the 30-year normals, a typical April afternoon reaches 62 °F in Des Moines and 58 °F in Mason City and Dubuque, while nights range from the mid-30s in the north to about 41 °F in Des Moines. Precipitation totals 3 to 4 inches, and 6 to 8 days a month bring at least a tenth of an inch. Snow averages 1 to 3 inches. The state climatologist's monthly summaries show the range. April 2021 was dry: 1.51 inches statewide, 2.00 inches below normal and the 16th driest April in 149 years of records, with a high of 93 °F at DeSoto on the 26th and a low of 11 °F at Estherville and Battle Creek on the 1st. April 2024 was wet, with 4.16 inches, 0.49 inch above normal, a snowy start (5.7 inches at Dubuque on the 2nd), a low of 9 °F at Elkader on the 6th and an 89 °F high at Spencer and Winterset on the 13th and 14th.

Three things to watch. First, severe storms: the monthly summary for April 2024 recorded a tornado near Minburn on the 16th that stayed on the ground nearly seven miles, an EF-1 at Rockwell City, a longer EF-2 near Salem, 2-inch hail at Massena on the 30th and a weak tornado near Millerton the same day. Know where your shelter is, keep a weather alert on, and see the Des Moines forecast office's preparedness page for the year's awareness dates. Second, flooding: April rain on saturated or frozen ground fills creeks quickly, and the table shows six to eight days with measurable rain in a typical April. Third, late freezes, covered in the first section. The Climate Prediction Center issues fresh three-month outlooks each month on its 90-day page. For current conditions open the forecast page; the cloud guide explains what an approaching front looks like.

Between April 1 and April 30 every Iowa city on the table gains between 75 and 81 minutes, which works out to roughly 2.6 to 2.8 minutes more light each day. The northern cities gain the most. By the last day of the month the sun is up for just under 14 hours in Burlington and Des Moines and 14 hours 6 minutes in Decorah. These are sunrise-to-sunset lengths, so the clock does not affect them, and the gain is slightly slower than in March because the rate peaks at the equinox and eases toward the June solstice.

Use the daylight calculator for your own town. All of April is on daylight time, so sunrise and sunset clock times sit an hour later than they did in early March.

Jupiter owns the April evenings, shining in Leo and Cancer and staying up into the small hours. The Moon glides past it on the 14th and 15th, about two-thirds lit, and the faint reddish dot of Mars sits roughly 3 degrees from the Moon on the 15th. Before dawn, brilliant Venus is already above the eastern horizon some 75 minutes before sunrise on April 1 (a rough number worked out for mid-America), with a thin waning crescent hanging beside it at dawn on April 3 and 4. Saturn cannot be seen this month, because it passes behind the Sun on April 7. Every time below is Central Daylight Time.

The new moon on the 6th brings the month's darkest evenings. For other months' phases, see the moon phases page.

1. Wednesday, April 14: Homeschool in the Hills, Geometry in Nature, at Hitchcock Nature Center in the Loess Hills, listed on the Pottawattamie County Conservation calendar as two sessions, 10 to 11 a.m. and 1 to 2 p.m., at $5 for each child.
2. Tuesday, April 20: the Pink Moon at dusk. Go out after supper and look east.
3. Thursday, April 22: Earth Day. Pick up litter on a stream bank, plant a native shrub or start a nature journal.
4. Friday, April 30: Iowa's Arbor Day, set by statute as the last Friday of April. Plant a tree, or visit one you planted.
5. Spring wildflower walks. In 2026 Story County Conservation cosponsored free walks, led by Outdoor Alliance of Story County volunteers, on April 23, April 30 and May 7 at Reactor Woods, Robison Wildlife Area and Soper's Mill. The 2027 dates have not been posted, so check with Story County Conservation.
6. Nature centers. Indian Creek Nature Center in Cedar Rapids, Hartman Reserve in Cedar Falls and other county nature centers post their April programs close to the date; their 2027 calendars were still blank when we looked, so call or check their sites.
7. Every day: be a field observer. Subscribe to the DNR's wildflower emails, volunteer for its frog and toad listening routes, and write down the day you first hear an American toad or see a purple martin. Journey North takes hummingbird reports.

March's guide is at /nature/iowa/march; the nature hub has every state.

• Spring turkey season. By the DNR's 2027 dates, April 9 to 11 is the youth window, seasons 1 to 3 run April 12 to 15, 16 to 20 and 21 to 27, and season 4 runs April 28 to May 16. Other open seasons that overlap April include beaver hunting and trapping through April 15, coyote hunting and trapping, which are continuous, and the light goose conservation order through May 1, 2027.
• Blaze orange. Iowa's orange law, Iowa Code 481A.122, names firearm deer hunting and upland game birds, not turkeys, and the DNR's turkey page mentions no orange requirement. Even so, the DNR's morel guide recommends orange for mushroom hunters and warns against red, white and blue clothing when turkey hunters are out.
• Prescribed burns. One DNR wildlife unit's 2025 notice said its prescribed burns usually fall between mid-March and mid-May, starting mid to late morning and wrapping up by late afternoon or early evening. Keep out of any unit with a crew on site, and do not drive through smoke.
• Ticks. The DNR's turkey biologist warned in 2025 that ticks were already out by April 8. Wear repellent, cover your legs, and look yourself over once you are back at the car.
• Snakes. Most Iowa snakes are harmless. Timber rattlesnakes live in eastern Iowa's rocky bluff country and are protected by state law. Anyone who is bitten should stay calm and seek medical attention. Give any snake room.
• Cold water and swift streams. April rivers are high, cold and fast. Keep children and dogs back from banks and stay off ice remnants.
• Storms and floods. Never drive through water on a road, and follow the tornado watches and warnings that come with the first strong April fronts.
• Nests and young. Peregrines and many other birds are on eggs in April. Watch from a distance and leave eggs and young animals alone.