Great Lakes Region and Northern Ohio Valley Face Frost Concerns With Morning Lows in the Mid-30s Through Saturday May 15

CLEVELAND, Ohio — Frost concerns are in place across the Great Lakes region and the Northern Ohio Valley through Saturday, May 15, 2026, with morning lows expected to drop into the mid-30s F over the next 5 days.

Warmer temperatures are expected to push eastward later this week, but colder air will hold on just a little longer across the Great Lakes and Northern Ohio Valley before relief arrives.

Where Frost Is Most Likely

The frost concern area covers a broad zone across the Great Lakes region and into the Northern Ohio Valley through Saturday, May 15:

• Morning lows in the mid-30s F are forecast across the Great Lakes and Northern Ohio Valley at 8:00 AM EDT during this period, putting sensitive plants and late-season crops at risk of frost damage.
• The temperature anomaly map shows readings ranging from -4 F to -18 F below normal across the affected zones, indicating how significantly colder this air mass is compared to typical mid-May conditions.
• Areas along and north of the dashed frost watch boundary on the map face the highest overnight frost risk through Saturday, May 15.

Why It Is Still Cold

Warmer temperatures building across the West have not yet made it to the Great Lakes and Northern Ohio Valley. That warmer air is expected to bleed eastward later this week, but the short-term outlook keeps cold mornings in place through May 15.

Once the warmer pattern arrives, morning lows will rise and frost concerns will ease across the region.

What Residents and Gardeners Should Do Now

Anyone in the Great Lakes region or Northern Ohio Valley should take action before each overnight period through Saturday, May 15:

• Cover sensitive plants, garden seedlings and any frost-vulnerable vegetation each evening before temperatures drop, as mid-30s F lows are cold enough to damage or kill unprotected plants overnight.
• Bring any potted plants indoors or into a garage each night through Saturday, May 15 until the warming trend arrives.
• Expect cold and potentially frosty mornings every day through Saturday before conditions gradually improve heading into next week.

WaldronNews.com will continue tracking frost concerns across the Great Lakes region and Northern Ohio Valley and will provide updates as morning low temperatures and the timing of the warming trend through Saturday, May 15 develop.