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Pennsylvania · county maple atlas

Maple sugaring in Westmoreland County, Pennsylvania

Westmoreland County had 12 maple operations and 4,948 taps in the 2022 Census. Around Greensburg, sap usually runs from February 12 to March 14. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 129 days until the usual start.
Sap starts
Feb 12
typical year
Season ends
Mar 14
about 4 weeks
Sap days / season
48.9
1991–2026 average
Taps, 2022
4,948
#17 of 45 in PA

Sap-flow outlook at Greensburg right now

Full Pennsylvania forecast →

Forecast for Greensburg, PA

Updated Oct 6, 8:36 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Westmoreland County's season usually opens around February 12, which is 129 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    42° / 72°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    53° / 72°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    45° / 68°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    44° / 72°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    51° / 70°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    54° / 72°
    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 Greensburg

Freeze-thaw weather at Greensburg peaks in the weeks of Jan 26 to Mar 30, which hold about 57% of a season's sap days. March is the busiest month.
Typical season: Feb 12 – Mar 140246Week of Dec 1: 2.1 sap days on averageWeek of Dec 8: 2.8 sap days on averageWeek of Dec 15: 2.6 sap days on averageWeek of Dec 22: 2.3 sap days on averageWeek of Dec 29: 1.9 sap days on averageWeek of Jan 5: 2.0 sap days on averageWeek of Jan 12: 1.7 sap days on averageWeek of Jan 19: 1.5 sap days on averageWeek of Jan 26: 2.2 sap days on averageWeek of Feb 2: 2.9 sap days on averageWeek of Feb 9: 2.6 sap days on averageWeek of Feb 16: 2.8 sap days on averageWeek of Feb 23: 2.8 sap days on averageWeek of Mar 2: 3.3 sap days on averageWeek of Mar 9: 3.1 sap days on averageWeek of Mar 16: 2.9 sap days on averageWeek of Mar 23: 3.0 sap days on averageWeek of Mar 30: 2.3 sap days on averageWeek of Apr 6: 1.8 sap days on averageWeek of Apr 13: 1.0 sap days on averageWeek of Apr 20: 0.7 sap days on averageWeek of Apr 27: 0.3 sap days on averageWeek of May 4: 0.1 sap days on averageWeek of May 11: 0.1 sap days on averageWeek of May 18: 0.1 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Feb 12
Average number of freeze-thaw sap days in each week of the season at Greensburg, 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 7; the middle half of seasons fell between Jan 25 and Feb 14. Earliest Jan 10 (2023), latest Mar 2 (2013).
Closing signal
Median Mar 11; middle half between Feb 22 and Mar 19. Earliest Feb 13 (2005), latest Apr 6 (2013).
Sap days by month
Dec22%Jan16%Feb23%Mar27%Apr11%May1%

36 seasons of sap weather

Westmoreland County seasons, 1991–2026

The best sap year at Greensburg was 1999 with 67 freeze-thaw days; the leanest was 2010 with 34. 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: Jan 31 – Mar 3, 36 sap days3620252025: Feb 8 – Mar 10, 47 sap days4720242024: Feb 3 – Feb 22, 45 sap days4520232023: Jan 10 – Feb 13, 59 sap days5920222022: Feb 8 – Mar 15, 48 sap days4820212021: Feb 14 – Mar 21, 44 sap days4420202020: Jan 22 – Feb 24, 48 sap days4820192019: Feb 7 – Mar 14, 49 sap days4920182018: Jan 26 – Feb 19, 61 sap days6120172017: Jan 14 – Feb 18, 39 sap days3920162016: Feb 4 – Mar 8, 47 sap days4720152015: Feb 28 – Apr 2, 42 sap days4220142014: Feb 27 – Apr 1, 43 sap days4320132013: Mar 2 – Apr 6, 56 sap days5620122012: Jan 27 – Mar 3, 61 sap days6120112011: Feb 14 – Mar 21, 39 sap days3920102010: Feb 20 – Mar 17, 34 sap days3420092009: Feb 9 – Mar 15, 51 sap days5120082008: Feb 7 – Mar 14, 58 sap days5820072007: Feb 8 – Mar 13, 44 sap days4420062006: Jan 13 – Feb 15, 51 sap days5120052005: Jan 25 – Feb 13, 42 sap days4220042004: Feb 12 – Mar 19, 48 sap days4820032003: Feb 18 – Mar 24, 36 sap days3620022002: Jan 17 – Feb 20, 54 sap days5420012001: Feb 15 – Mar 20, 45 sap days4520002000: Jan 23 – Feb 22, 51 sap days5119991999: Jan 13 – Feb 16, 67 sap days6719981998: Jan 14 – Feb 16, 49 sap days4919971997: Jan 24 – Feb 28, 57 sap days5719961996: Feb 9 – Mar 15, 49 sap days4919951995: Feb 15 – Mar 12, 55 sap days5519941994: Feb 25 – Apr 1, 52 sap days5219931993: Feb 19 – Mar 20, 45 sap days4519921992: Jan 28 – Mar 3, 53 sap days5319911991: Jan 29 – Mar 5, 54 sap days54
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Greensburg. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Westmoreland County in the Census of Agriculture

USDA counts maple operations every five years. In Westmoreland County the 2022 Census found 12 farms making syrup (+33% since 2017), with taps +369% and syrup output +407% over the same five years. That works out to about 0.23 gallons of syrup per tap in 2022 (0.22 in 2017). Among the 385 counties in this atlas, Westmoreland County ranks 191 by taps.

Westmoreland County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
2022124,9481,1560.23
201791,0562280.22

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 Greensburg (1,083ft), 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

Westmoreland County sugaring questions

When should I tap maple trees in Westmoreland County, Pennsylvania?
In a typical year the sap starts running around February 12 near Greensburg and the season winds down around March 14. 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 10 and as late as Mar 2.
How much maple syrup does Westmoreland County produce?
The 2022 Census of Agriculture counted 12 maple operations in Westmoreland County with 4,948 taps producing 1,156 gallons of syrup, ranking 17 of 45 Pennsylvania's counties with published tap counts.
How many sap days does Westmoreland County get in a season?
On average 48.9 freeze-thaw sap days from December through May at Greensburg, of which about 14.7 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 1999 (67 sap days); the leanest was 2010 (34).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Greensburg (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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