Pennsylvania sap flow forecast

The next several days for Pennsylvania'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 late February.

Somerset County has 295,430 of Pennsylvania's 918,865 taps (32.2%), the most in the state (2022 Census of Agriculture).

Forecast for Meyersdale

Updated Sep 26, 8:05 AM EDT

It's the off-season. Sap needs freezing nights, and there are none in sight. Pennsylvania's season usually opens around February 25 — 152 days from now.

No freeze-thaw days in the forecast

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

  1. SunSep 27
    60°high
    50°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 50°F — trees need a hard freeze to reload. No freeze, no run.

  2. MonSep 28
    62°high
    53°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 53°F — trees need a hard freeze to reload. No freeze, no run.

  3. TueSep 29
    68°high
    54°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 54°F — trees need a hard freeze to reload. No freeze, no run.

  4. WedSep 30
    72°high
    53°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 53°F — trees need a hard freeze to reload. No freeze, no run.

  5. ThuOct 1
    72°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.

  6. FriOct 2
    70°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.

Crawford County in northwestern Pennsylvania ranks second with 153,895 taps (16.7%; 2022 Census of Agriculture).

Forecast for Meadville

Updated Sep 26, 3:47 AM EDT

It's the off-season. Sap needs freezing nights, and there are none in sight. Pennsylvania's season usually opens around February 25 — 152 days from now.

No freeze-thaw days in the forecast

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

  1. SunSep 27
    67°high
    54°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 54°F — trees need a hard freeze to reload. No freeze, no run.

  2. MonSep 28
    68°high
    56°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 56°F — trees need a hard freeze to reload. No freeze, no run.

  3. TueSep 29
    73°high
    55°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 55°F — trees need a hard freeze to reload. No freeze, no run.

  4. WedSep 30
    73°high
    54°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 54°F — trees need a hard freeze to reload. No freeze, no run.

  5. ThuOct 1
    74°high
    59°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 59°F — trees need a hard freeze to reload. No freeze, no run.

  6. FriOct 2
    71°high
    59°low
    0h frozen
    21h thawed
    No freeze, no run

    Low of 59°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.

Potter and Tioga counties on the northern tier together hold 218,080 taps (23.7%; 2022 Census of Agriculture).

Forecast for Coudersport

Updated Sep 26, 8:05 AM EDT

It's the off-season. Sap needs freezing nights, and there are none in sight. Pennsylvania's season usually opens around February 25 — 152 days from now.

No freeze-thaw days in the forecast

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

  1. SunSep 27
    60°high
    50°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 50°F — trees need a hard freeze to reload. No freeze, no run.

  2. MonSep 28
    64°high
    52°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 52°F — trees need a hard freeze to reload. No freeze, no run.

  3. TueSep 29
    68°high
    52°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 52°F — trees need a hard freeze to reload. No freeze, no run.

  4. WedSep 30
    70°high
    50°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 50°F — trees need a hard freeze to reload. No freeze, no run.

  5. ThuOct 1
    71°high
    53°low
    0h frozen
    24h thawed
    No freeze, no run

    Low of 53°F — trees need a hard freeze to reload. No freeze, no run.

  6. FriOct 2
    69°high
    55°low
    0h frozen
    21h thawed
    No freeze, no run

    Low of 55°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 Pennsylvania?

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 Pennsylvania →

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

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