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Pennsylvania · county maple atlas

Maple sugaring in Clinton County, Pennsylvania

Clinton County had 7 maple operations and 654 taps in the 2022 Census. Around Lock Haven, sap usually runs from February 24 to March 26. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 141 days until the usual start.
Sap starts
Feb 24
typical year
Season ends
Mar 26
about 4 weeks
Sap days / season
52.1
1991–2026 average
Taps, 2022
654
#29 of 45 in PA

Sap-flow outlook at Lock Haven right now

Full Pennsylvania forecast →

Forecast for Lock Haven, PA

Updated Oct 6, 8:31 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Clinton County's season usually opens around February 24, which is 141 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    41° / 71°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    50° / 73°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    43° / 69°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    43° / 72°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    46° / 71°

    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 Lock Haven

Freeze-thaw weather at Lock Haven peaks in the weeks of Feb 2 to Apr 6, which hold about 59% of a season's sap days. March is the busiest month.
Typical season: Feb 24 – Mar 260246Week of Dec 1: 2.4 sap days on averageWeek of Dec 8: 2.4 sap days on averageWeek of Dec 15: 2.3 sap days on averageWeek of Dec 22: 2.4 sap days on averageWeek of Dec 29: 2.2 sap days on averageWeek of Jan 5: 1.8 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: 2.0 sap days on averageWeek of Feb 2: 2.8 sap days on averageWeek of Feb 9: 2.6 sap days on averageWeek of Feb 16: 3.2 sap days on averageWeek of Feb 23: 2.9 sap days on averageWeek of Mar 2: 3.7 sap days on averageWeek of Mar 9: 3.8 sap days on averageWeek of Mar 16: 3.6 sap days on averageWeek of Mar 23: 3.4 sap days on averageWeek of Mar 30: 2.7 sap days on averageWeek of Apr 6: 2.4 sap days on averageWeek of Apr 13: 1.2 sap days on averageWeek of Apr 20: 0.8 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: 0.0 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Feb 24
Average number of freeze-thaw sap days in each week of the season at Lock Haven, 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 19; the middle half of seasons fell between Feb 7 and Feb 26. Earliest Jan 17 (2023), latest Mar 9 (2015).
Closing signal
Median Mar 23; middle half between Mar 13 and Apr 2. Earliest Feb 20 (2023), latest Apr 12 (2015).
Sap days by month
Dec20%Jan15%Feb22%Mar30%Apr12%May0%

36 seasons of sap weather

Clinton County seasons, 1991–2026

The best sap year at Lock Haven was 2012 with 73 freeze-thaw days; the leanest was 2003 with 36. 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 9 – Mar 14, 49 sap days4920252025: Feb 12 – Mar 19, 46 sap days4620242024: Jan 28 – Mar 3, 51 sap days5120232023: Jan 17 – Feb 20, 70 sap days7020222022: Feb 14 – Mar 15, 50 sap days5020212021: Feb 19 – Mar 24, 54 sap days5420202020: Feb 7 – Mar 13, 66 sap days6620192019: Feb 27 – Apr 3, 48 sap days4820182018: Feb 28 – Apr 3, 60 sap days6020172017: Jan 31 – Mar 7, 45 sap days4520162016: Feb 7 – Mar 13, 57 sap days5720152015: Mar 9 – Apr 12, 41 sap days4120142014: Mar 8 – Apr 10, 43 sap days4320132013: Mar 5 – Apr 7, 54 sap days5420122012: Feb 7 – Mar 13, 73 sap days7320112011: Mar 1 – Apr 3, 40 sap days4020102010: Feb 12 – Mar 19, 37 sap days3720092009: Feb 21 – Mar 26, 54 sap days5420082008: Feb 26 – Apr 1, 53 sap days5320072007: Feb 20 – Mar 22, 52 sap days5220062006: Feb 6 – Mar 9, 61 sap days6120052005: Feb 25 – Mar 26, 45 sap days4520042004: Feb 22 – Mar 25, 45 sap days4520032003: Feb 26 – Apr 2, 36 sap days3620022002: Feb 1 – Mar 8, 67 sap days6720012001: Mar 3 – Apr 5, 47 sap days4720002000: Feb 2 – Mar 9, 55 sap days5519991999: Feb 21 – Mar 27, 58 sap days5819981998: Jan 26 – Feb 27, 54 sap days5419971997: Feb 19 – Mar 25, 67 sap days6719961996: Feb 25 – Apr 1, 49 sap days4919951995: Feb 10 – Mar 14, 59 sap days5919941994: Mar 5 – Apr 8, 51 sap days5119931993: Mar 3 – Apr 7, 41 sap days4119921992: Feb 3 – Mar 3, 47 sap days4719911991: Feb 12 – Mar 17, 51 sap days51
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Lock Haven. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Clinton County in the Census of Agriculture

USDA counts maple operations every five years. In Clinton County the 2022 Census found 7 farms making syrup (+133% since 2017). That works out to about 0.13 gallons of syrup per tap in 2022. Among the 385 counties in this atlas, Clinton County ranks 301 by taps.

Clinton County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
20227654820.13
20173withheldwithheld—

“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 Lock Haven (646ft), 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

Clinton County sugaring questions

When should I tap maple trees in Clinton County, Pennsylvania?
In a typical year the sap starts running around February 24 near Lock Haven and the season winds down around March 26. 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 17 and as late as Mar 9.
How much maple syrup does Clinton County produce?
The 2022 Census of Agriculture counted 7 maple operations in Clinton County with 654 taps producing 82 gallons of syrup, ranking 29 of 45 Pennsylvania's counties with published tap counts.
How many sap days does Clinton County get in a season?
On average 52.1 freeze-thaw sap days from December through May at Lock Haven, of which about 18.2 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2012 (73 sap days); the leanest was 2003 (36).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Lock Haven (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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