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Pennsylvania · county maple atlas

Maple sugaring in Warren County, Pennsylvania

Warren County had 11 maple operations and 5,945 taps in the 2022 Census. Around Warren, sap usually runs from March 2 to April 2. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 147 days until the usual start.
Sap starts
Mar 2
typical year
Season ends
Apr 2
about 4 weeks
Sap days / season
45.8
1991–2026 average
Taps, 2022
5,945
#15 of 45 in PA

Sap-flow outlook at Warren right now

Full Pennsylvania forecast →

Forecast for Warren, PA

Updated Oct 6, 8:31 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Warren County's season usually opens around March 2, which is 147 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    39° / 71°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    48° / 69°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    40° / 66°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    39° / 71°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    47° / 71°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    51° / 71°
    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 Warren

Freeze-thaw weather at Warren peaks in the weeks of Feb 16 to Apr 6, which hold about 50% of a season's sap days. March is the busiest month.
Typical season: Mar 2 – Apr 20246Week of Dec 1: 1.8 sap days on averageWeek of Dec 8: 2.0 sap days on averageWeek of Dec 15: 1.7 sap days on averageWeek of Dec 22: 1.9 sap days on averageWeek of Dec 29: 1.4 sap days on averageWeek of Jan 5: 1.4 sap days on averageWeek of Jan 12: 1.4 sap days on averageWeek of Jan 19: 1.0 sap days on averageWeek of Jan 26: 1.5 sap days on averageWeek of Feb 2: 1.9 sap days on averageWeek of Feb 9: 1.6 sap days on averageWeek of Feb 16: 2.4 sap days on averageWeek of Feb 23: 2.3 sap days on averageWeek of Mar 2: 2.7 sap days on averageWeek of Mar 9: 2.9 sap days on averageWeek of Mar 16: 3.2 sap days on averageWeek of Mar 23: 3.1 sap days on averageWeek of Mar 30: 3.3 sap days on averageWeek of Apr 6: 2.8 sap days on averageWeek of Apr 13: 1.8 sap days on averageWeek of Apr 20: 1.7 sap days on averageWeek of Apr 27: 1.2 sap days on averageWeek of May 4: 0.6 sap days on averageWeek of May 11: 0.3 sap days on averageWeek of May 18: 0.2 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Mar 2
Average number of freeze-thaw sap days in each week of the season at Warren, 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 25; the middle half of seasons fell between Feb 18 and Mar 4. Earliest Jan 24 (2017), latest Mar 11 (2015).
Closing signal
Median Mar 30; middle half between Mar 21 and Apr 5. Earliest Feb 28 (2017), latest Apr 13 (2015).
Sap days by month
Dec17%Jan13%Feb18%Mar29%Apr21%May2%

36 seasons of sap weather

Warren County seasons, 1991–2026

The best sap year at Warren was 2020 with 66 freeze-thaw days; the leanest was 2003 with 26. 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 8 – Mar 15, 40 sap days4020252025: Feb 22 – Mar 28, 36 sap days3620242024: Feb 1 – Mar 3, 45 sap days4520232023: Feb 18 – Mar 22, 65 sap days6520222022: Feb 24 – Mar 31, 49 sap days4920212021: Feb 23 – Mar 30, 47 sap days4720202020: Feb 19 – Mar 24, 66 sap days6620192019: Mar 5 – Apr 6, 47 sap days4720182018: Feb 27 – Apr 3, 53 sap days5320172017: Jan 24 – Feb 28, 35 sap days3520162016: Feb 11 – Mar 14, 57 sap days5720152015: Mar 11 – Apr 13, 38 sap days3820142014: Mar 10 – Apr 10, 38 sap days3820132013: Mar 8 – Apr 7, 42 sap days4220122012: Feb 11 – Mar 13, 62 sap days6220112011: Mar 8 – Apr 7, 35 sap days3520102010: Feb 25 – Apr 1, 45 sap days4520092009: Feb 26 – Apr 1, 47 sap days4720082008: Mar 5 – Apr 5, 40 sap days4020072007: Feb 20 – Mar 22, 32 sap days3220062006: Feb 21 – Mar 28, 42 sap days4220052005: Mar 3 – Apr 5, 39 sap days3920042004: Feb 25 – Mar 26, 42 sap days4220032003: Feb 27 – Apr 2, 26 sap days2620022002: Feb 8 – Mar 12, 62 sap days6220012001: Mar 8 – Apr 5, 37 sap days3720002000: Feb 16 – Mar 15, 48 sap days4819991999: Feb 28 – Mar 30, 55 sap days5519981998: Feb 2 – Mar 8, 42 sap days4219971997: Feb 23 – Mar 25, 53 sap days5319961996: Mar 9 – Apr 12, 48 sap days4819951995: Feb 15 – Mar 19, 54 sap days5419941994: Mar 10 – Apr 12, 52 sap days5219931993: Mar 4 – Apr 7, 38 sap days3819921992: Mar 4 – Apr 7, 44 sap days4419911991: Feb 21 – Mar 27, 49 sap days49
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Warren. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Warren County in the Census of Agriculture

USDA counts maple operations every five years. In Warren County the 2022 Census found 11 farms making syrup (+38% since 2017), with taps +41% and syrup output +67% over the same five years. That works out to about 0.25 gallons of syrup per tap in 2022 (0.21 in 2017). Among the 385 counties in this atlas, Warren County ranks 180 by taps.

Warren County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
2022115,9451,4750.25
201784,2228820.21

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 Warren (1,293ft), 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

Warren County sugaring questions

When should I tap maple trees in Warren County, Pennsylvania?
In a typical year the sap starts running around March 2 near Warren and the season winds down around April 2. 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 24 and as late as Mar 11.
How much maple syrup does Warren County produce?
The 2022 Census of Agriculture counted 11 maple operations in Warren County with 5,945 taps producing 1,475 gallons of syrup, ranking 15 of 45 Pennsylvania's counties with published tap counts.
How many sap days does Warren County get in a season?
On average 45.8 freeze-thaw sap days from December through May at Warren, of which about 13.4 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2020 (66 sap days); the leanest was 2003 (26).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Warren (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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