A Warm Week Doesn't Mean Spring Has Arrived

Every year in Indiana, we get that stretch. A few warm days in April. Sun feels good. Air feels right. And it tricks people into thinking, “Alright, it's time.”

But if you've been around long enough, you know — spring doesn't arrive all at once here. It shows up, leaves, and then comes back again.

This isn't unusual. It's the pattern. Historical weather trends — and long-range observations like those published by the Old Farmer's Almanac — show that the Midwest regularly experiences late frosts, cold nights well into May, and wide temperature swings. In central Indiana, the average last frost date still sits around late April to early May. So even if it feels like spring, the calendar says otherwise.

The mistake isn't planting early. The mistake is assuming a few warm days means stable conditions. Plants don't respond to a single afternoon in the 70s. They respond to:

• ✓ Soil temperature
• ✓ Nighttime lows
• ✓ Consistency over time

And that's where early spring falls apart.

When plants go out too soon, you'll often see growth that just stops, leaves discoloring, root systems that never really establish, and increased susceptibility to disease. They don't always die — they just don't thrive. And once a plant stalls, it's hard to fully catch back up.

If you want to stay ahead of the season without getting burned, focus on what actually matters.

• ✓ Do: Watch nighttime temperatures (these matter more than daytime highs). Pay attention to soil warmth, not just air temperature. Start with cold-tolerant plants (pansies, perennials, early greens). Use this time to prep beds, containers, and fertilizer programs.
• ✓ Don't: Let a warm weekend dictate your entire planting schedule. Rush warm-season crops into cold soil. Assume the weather has “turned the corner.”

From the greenhouse side, this is one of the hardest moments of the year. Plants are ready. Customers are ready. The weather looks ready. But readiness isn't about how it looks — it's about stability. And early spring rarely gives you that.

Instead of asking, “Is it warm right now?” ask, “Is it going to stay warm?” Plants don't care about today. They care about the next two weeks.

Reference: Purdue University Extension — Indiana gardening resources