A frosty start to the day reminded Indiana that spring can still bring a touch of winter. Temperatures this morning dropped low enough in parts of the state for frost to form, prompting a freeze warning for much of the state and marking one of the last notable cold snaps of the season.
Climate Prediction Center forecasts point to a gradual warming trend as the influence of the fading polar vortex continues to wane. While brief cool-downs remain possible, models show temperatures trending closer to — and in some areas above — normal over the coming weeks.
At the same time, an active storm track will bring periodic rain and unsettled weather across the Ohio Valley, especially through mid-April. That mix of warming temperatures and intermittent systems suggests Indiana’s frost season is nearing its end, though isolated freezes may still occur in colder pockets.
When is the latest freeze in Indiana?
According to the National Weather Service offices in Indianapolis and Northern Indiana, here are the latest freeze dates around the state:
Indianapolis
Bloomington
Fort Wayne
South Bend
Indiana weather forecast for April
April will bring a mix of lingering chilly snaps and gradually warming conditions. Weather systems fueled by Gulf moisture, mid-level ridges, and cold fronts will keep rain, storms and occasional flooding possible across parts of the U.S.
Here’s what’s in the forecast week by week:
April 9-13 weather forecast
Later this week, a trough over the western U.S. will help drive an active pattern into the Ohio Valley, including Indiana, as storm systems track east out of the Plains. Expect multiple rounds of showers and thunderstorms from late week into the weekend, with the potential for periods of steady rain rather than one single event, according to the Climate Prediction Center.
While the heaviest rainfall focus is expected farther south — across the Southern Plains and Lower Mississippi Valley — Indiana and surrounding states could still see localized flooding, especially if storms repeatedly move over the same areas.
Temperatures across the Ohio Valley will start slightly below normal, lingering from recent cooler air tied to the fading polar vortex influence, before a gradual warming trend develops into the weekend and early next week.
April 14-20 weather forecast
By mid-April, the pattern across the Ohio Valley, including Indiana, tilts warmer and wetter than normal, even as storm systems continue to move through, according to the Climate Prediction Center.
The key period remains Tuesday–Wednesday, April 14–15, when a developing low-pressure system is expected to bring widespread rain and gusty winds. Forecast guidance supports above-normal precipitation overall, with many areas likely picking up around an inch of rain or more over several days. That raises the risk for localized flooding, especially where heavier rain bands set up.
At the same time, temperatures are expected to trend above normal, signaling a shift away from the recent cooler pattern. That added warmth will help fuel a more active storm track, keeping conditions mild but unsettled rather than cold and stormy.
Winds may also increase ahead of the system, with periods of gusty conditions possible Tuesday into Wednesday, though current signals point to more of a nuisance wind setup than a widespread damaging event.
Late April (April 18-May 1) weather forecast
Looking toward the second half of April, there’s no strong temperature signal for the Ohio Valley, including Indiana, meaning conditions could swing either side of normal at times. That fits a typical spring setup, with variability from passing systems rather than a locked-in warm or cool pattern.
Precipitation is also less certain. Unlike the Southwest, where a wetter-than-normal signal is clearer, the Ohio Valley falls into an “equal chances” zone, meaning there’s no strong lean toward wetter or drier than average overall.
That said, “equal chances” doesn’t mean quiet. It points to a pattern where periodic systems still bring rounds of rain, but without a clear signal for prolonged wet or dry stretches. In other words, expect typical spring variability — mild swings in temperature and occasional rain chances — rather than extremes.
Indiana spring weather forecast
Both AccuWeather and the Old Farmer’s Almanac suggest that spring 2026 will be a season of contrasts across the U.S. The northern and eastern states are expected to experience a slower transition to spring warmth, with lingering cool spells, late-season frost and even the occasional snow.
Both forecasts highlight the potential for flooding across the Mississippi and Ohio River valleys due to a combination of spring rains and snowmelt.
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Brandi D. Addison covers weather across the United States as the Weather Connect Reporter for the USA TODAY Network. She can be reached at baddison@gannett.com. Find her on Facebook here.
This article originally appeared on Indianapolis Star: Last freeze for Indiana? 10 maps show weekly outlook — plus historic data
Reporting by Brandi D. Addison, USA TODAY NETWORK / Indianapolis Star
USA TODAY Network via Reuters Connect
