Indiana sap flow forecast

The next several days for Indiana's sugaring country, read the way a sugarmaker reads them: how cold the night gets, how warm the afternoon gets, and whether that adds up to a run. The season here usually opens early February.

LaGrange County has the most taps in Indiana (19,869 of 107,234); with Elkhart, Marshall and Kosciusko counties, northern Indiana holds 57% of the state's taps (2022 Census of Agriculture).

Forecast for LaGrange

Updated Sep 26, 6:44 AM EDT

It's the off-season. Sap needs freezing nights, and there are none in sight. Indiana's season usually opens around February 10 — 137 days from now.

No freeze-thaw days in the forecast

Blue = below 32°F · Amber = thaw · dashed line = freezing

  1. SunSep 27
    70°high
    44°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 44°F — trees need a hard freeze to reload. No freeze, no run.

  2. MonSep 28
    72°high
    46°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 46°F — trees need a hard freeze to reload. No freeze, no run.

  3. TueSep 29
    73°high
    48°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 48°F — trees need a hard freeze to reload. No freeze, no run.

  4. WedSep 30
    69°high
    57°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 57°F — trees need a hard freeze to reload. No freeze, no run.

  5. ThuOct 1
    70°high
    61°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 61°F — trees need a hard freeze to reload. No freeze, no run.

  6. FriOct 2
    68°high
    58°low
    0h frozen
    21h thawed
    No freeze, no run

    Low of 58°F — trees need a hard freeze to reload. No freeze, no run.

Data: National Weather Service. Verdicts use freeze-thaw thresholds from maple field research; your woods may run a little differently.

Somewhere else in Indiana?

Your sugarbush, your forecast

Hourly temperatures for your exact spot, turned into a day-by-day sap-run outlook. US and Canada.

Planning ahead? Typical tapping dates for Indiana →

Data & method

  1. National Weather Service API — NOAA National Weather Service
  2. Sap flow in sugar maple: timing and weather drivers (Frontiers in Agronomy, 2025) — de Lima Santos et al.
  3. Maple Sugaring Tips for Beginners and Backyard Maple Sugar Producers — UNH Extension
  4. North American Maple Syrup Producers Manual, 2nd ed. (Bulletin 856) — The Ohio State University Extension

Never miss the first run

LuckySap can ping you the evening before a strong sap day, then keeps your collections, sugar readings, and boils in one season log. Free on iPhone.

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