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Pennsylvania · county maple atlas

Maple sugaring in Clarion County, Pennsylvania

Clarion County had 5 maple operations and 310 taps in the 2022 Census. Around Clarion, sap usually runs from February 27 to March 30. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 144 days until the usual start.
Sap starts
Feb 27
typical year
Season ends
Mar 30
about 4 weeks
Sap days / season
49.4
1991–2026 average
Taps, 2022
310
#31 of 45 in PA

Sap-flow outlook at Clarion right now

Full Pennsylvania forecast →

Forecast for Clarion, PA

Updated Oct 6, 8:36 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Clarion County's season usually opens around February 27, which is 144 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    40° / 70°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    50° / 68°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    41° / 65°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    41° / 69°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    48° / 70°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    52° / 70°
    No refreeze forecast

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

When the sap runs

The sugaring calendar at Clarion

Freeze-thaw weather at Clarion peaks in the weeks of Feb 16 to Apr 6, which hold about 49% of a season's sap days. March is the busiest month.
Typical season: Feb 27 – Mar 300246Week of Dec 1: 2.1 sap days on averageWeek of Dec 8: 2.2 sap days on averageWeek of Dec 15: 2.0 sap days on averageWeek of Dec 22: 2.1 sap days on averageWeek of Dec 29: 1.6 sap days on averageWeek of Jan 5: 1.6 sap days on averageWeek of Jan 12: 1.5 sap days on averageWeek of Jan 19: 1.1 sap days on averageWeek of Jan 26: 1.6 sap days on averageWeek of Feb 2: 2.2 sap days on averageWeek of Feb 9: 1.8 sap days on averageWeek of Feb 16: 2.5 sap days on averageWeek of Feb 23: 2.4 sap days on averageWeek of Mar 2: 3.2 sap days on averageWeek of Mar 9: 3.1 sap days on averageWeek of Mar 16: 3.4 sap days on averageWeek of Mar 23: 3.5 sap days on averageWeek of Mar 30: 3.2 sap days on averageWeek of Apr 6: 2.8 sap days on averageWeek of Apr 13: 1.9 sap days on averageWeek of Apr 20: 1.6 sap days on averageWeek of Apr 27: 0.9 sap days on averageWeek of May 4: 0.5 sap days on averageWeek of May 11: 0.3 sap days on averageWeek of May 18: 0.3 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Feb 27
Average number of freeze-thaw sap days in each week of the season at Clarion, 1991–2026. A sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. The shaded band is the typical season.

Year-to-year spread

Opening signal
Median Feb 22; the middle half of seasons fell between Feb 14 and Mar 3. Earliest Jan 21 (2017), latest Mar 10 (2014).
Closing signal
Median Mar 27; middle half between Mar 19 and Apr 5. Earliest Feb 21 (2017), latest Apr 12 (1994).
Sap days by month
Dec19%Jan13%Feb18%Mar30%Apr19%May2%

36 seasons of sap weather

Clarion County seasons, 1991–2026

The best sap year at Clarion was 2020 with 70 freeze-thaw days; the leanest was 2011 with 32. Seasons that start early tend to end early too: the trees run on the swing between freezing nights and mild days, and heat ends it.
JanFebMarAprMaysap days20262026: Feb 10 – Mar 3, 37 sap days3720252025: Feb 18 – Mar 25, 36 sap days3620242024: Jan 31 – Mar 3, 44 sap days4420232023: Jan 30 – Mar 6, 63 sap days6320222022: Feb 17 – Mar 21, 52 sap days5220212021: Feb 21 – Mar 23, 47 sap days4720202020: Feb 14 – Mar 20, 70 sap days7020192019: Mar 3 – Apr 6, 52 sap days5220182018: Feb 22 – Mar 27, 54 sap days5420172017: Jan 21 – Feb 21, 33 sap days3320162016: Feb 10 – Mar 13, 60 sap days6020152015: Mar 9 – Apr 12, 40 sap days4020142014: Mar 10 – Apr 10, 44 sap days4420132013: Mar 8 – Apr 7, 47 sap days4720122012: Feb 11 – Mar 12, 69 sap days6920112011: Mar 7 – Apr 7, 32 sap days3220102010: Feb 25 – Mar 31, 46 sap days4620092009: Feb 26 – Apr 2, 52 sap days5220082008: Mar 5 – Apr 4, 41 sap days4120072007: Feb 20 – Mar 22, 47 sap days4720062006: Feb 20 – Mar 27, 45 sap days4520052005: Mar 2 – Apr 5, 41 sap days4120042004: Feb 26 – Mar 25, 43 sap days4320032003: Feb 27 – Apr 2, 33 sap days3320022002: Feb 13 – Mar 18, 68 sap days6820012001: Mar 6 – Apr 5, 42 sap days4220002000: Feb 5 – Mar 8, 52 sap days5219991999: Feb 28 – Mar 31, 58 sap days5819981998: Feb 2 – Mar 8, 50 sap days5019971997: Feb 22 – Mar 28, 65 sap days6519961996: Mar 8 – Apr 12, 45 sap days4519951995: Feb 14 – Mar 19, 66 sap days6619941994: Mar 9 – Apr 12, 49 sap days4919931993: Mar 4 – Apr 7, 45 sap days4519921992: Feb 20 – Mar 27, 52 sap days5219911991: Feb 21 – Mar 27, 57 sap days57
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Clarion. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Clarion County in the Census of Agriculture

USDA counts maple operations every five years. In Clarion County the 2022 Census found 5 farms making syrup (+150% since 2017). That works out to about 0.11 gallons of syrup per tap in 2022. Among the 385 counties in this atlas, Clarion County ranks 328 by taps.

Clarion County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
20225310340.11
20172withheldwithheld—

“Withheld” means USDA suppressed the figure to avoid disclosing data for individual operations; the farm count is still published.

Nearby

Neighboring maple counties

Distances are between reference towns; typical dates are each county's own estimate.

About these numbers

The season dates are estimated from 36 seasons of daily high and low temperatures for the PRISM 4-km grid cell at Clarion (1,414ft), scored with the same freeze-thaw rule as our live forecast: a sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. Each season's closing signal is the last sap day before accumulated warmth reaches a threshold, and the opening signal sits five weeks before that, never earlier than the first real freeze-thaw week. Tested against 117 state-seasons of USDA-reported dates, the rule lands within 5.5 days of the reported close and 6.6 days of the reported opening on average, and the typical dates shown here are scaled to Pennsylvania's USDA record (12 years). Production figures are copied from the Census as published. Full method, calibration tables and the downloadable dataset →

Sources · 6

  1. 1.2022 Census of Agriculture, County Level Data — Pennsylvania, Table 37: Maple Syrup, 2022 and 2017 · USDA National Agricultural Statistics Service
  2. 2.PRISM daily temperature grids (AN81d, 4 km), accessed 2026-10-05 · PRISM Group, Oregon State University, https://prism.oregonstate.edu
  3. 3.Applied Climate Information System (ACIS) web services · NOAA Regional Climate Centers
  4. 4.USDA NASS maple syrup reports — approximate average season opened and closed dates, 2011–2022 · USDA National Agricultural Statistics Service (mirrored by the University of Vermont)
  5. 5.Sap flow in sugar maple: timing and weather drivers (Frontiers in Agronomy, 2025) · de Lima Santos et al.
  6. 6.GeoNames gazetteer (cities500), CC BY 4.0 · GeoNames

FAQ

Clarion County sugaring questions

When should I tap maple trees in Clarion County, Pennsylvania?
In a typical year the sap starts running around February 27 near Clarion and the season winds down around March 30. Have your taps in a day or two before the first forecast string of freezing nights and 40 °F days. In the past 36 seasons the weather signal came as early as Jan 21 and as late as Mar 10.
How much maple syrup does Clarion County produce?
The 2022 Census of Agriculture counted 5 maple operations in Clarion County with 310 taps producing 34 gallons of syrup, ranking 31 of 45 Pennsylvania's counties with published tap counts.
How many sap days does Clarion County get in a season?
On average 49.4 freeze-thaw sap days from December through May at Clarion, of which about 13.3 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2020 (70 sap days); the leanest was 2011 (32).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Clarion (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for Pennsylvania. They describe a typical year at one point in the county; your sugarbush, slope and elevation can shift them by days.

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