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Ohio · county maple atlas

Maple sugaring in Darke County, Ohio

Darke County had 6 maple operations and 154 taps in the 2022 Census. Around Greenville, sap usually runs from February 16 to March 25. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 133 days until the usual start.
Sap starts
Feb 16
typical year
Season ends
Mar 25
about 5 weeks
Sap days / season
38.7
1991–2026 average
Taps, 2022
154
#55 of 63 in OH

Sap-flow outlook at Greenville right now

Full Ohio forecast →

Forecast for Greenville, OH

Updated Oct 6, 4:00 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Darke County's season usually opens around February 16, which is 133 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    48° / 77°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    53° / 71°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    45° / 69°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    47° / 75°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    54° / 74°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    54° / 77°
    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 Greenville

Freeze-thaw weather at Greenville peaks in the weeks of Jan 26 to Mar 30, which hold about 58% of a season's sap days. March is the busiest month.
Typical season: Feb 16 – Mar 250246Week of Dec 1: 2.0 sap days on averageWeek of Dec 8: 2.2 sap days on averageWeek of Dec 15: 2.2 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: 1.2 sap days on averageWeek of Jan 26: 1.7 sap days on averageWeek of Feb 2: 1.9 sap days on averageWeek of Feb 9: 2.0 sap days on averageWeek of Feb 16: 1.9 sap days on averageWeek of Feb 23: 2.4 sap days on averageWeek of Mar 2: 2.7 sap days on averageWeek of Mar 9: 2.4 sap days on averageWeek of Mar 16: 2.7 sap days on averageWeek of Mar 23: 2.6 sap days on averageWeek of Mar 30: 2.0 sap days on averageWeek of Apr 6: 1.6 sap days on averageWeek of Apr 13: 0.6 sap days on averageWeek of Apr 20: 0.3 sap days on averageWeek of Apr 27: 0.1 sap days on averageWeek of May 4: 0.1 sap days on averageWeek of May 11: 0.0 sap days on averageWeek of May 18: 0.0 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Feb 16
Average number of freeze-thaw sap days in each week of the season at Greenville, 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 11; the middle half of seasons fell between Feb 3 and Feb 21. Earliest Jan 15 (2017), latest Mar 8 (2003).
Closing signal
Median Mar 15; middle half between Mar 6 and Mar 21. Earliest Feb 16 (1998), latest Apr 6 (2014).
Sap days by month
Dec23%Jan16%Feb21%Mar30%Apr9%May0%

36 seasons of sap weather

Darke County seasons, 1991–2026

The best sap year at Greenville was 2018 with 52 freeze-thaw days; the leanest was 2003 with 23. 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, 34 sap days3420252025: Feb 8 – Mar 9, 35 sap days3520242024: Feb 3 – Feb 26, 39 sap days3920232023: Jan 17 – Feb 19, 47 sap days4720222022: Feb 11 – Mar 14, 44 sap days4420212021: Feb 21 – Mar 21, 36 sap days3620202020: Feb 4 – Mar 9, 39 sap days3920192019: Feb 18 – Mar 24, 39 sap days3920182018: Jan 26 – Feb 27, 52 sap days5220172017: Jan 15 – Feb 17, 31 sap days3120162016: Feb 4 – Feb 28, 35 sap days3520152015: Feb 28 – Apr 4, 31 sap days3120142014: Mar 7 – Apr 6, 26 sap days2620132013: Mar 2 – Apr 5, 41 sap days4120122012: Feb 2 – Mar 8, 44 sap days4420112011: Feb 13 – Mar 14, 27 sap days2720102010: Mar 4 – Mar 18, 27 sap days2720092009: Feb 10 – Mar 16, 41 sap days4120082008: Feb 15 – Mar 22, 38 sap days3820072007: Feb 15 – Mar 19, 38 sap days3820062006: Feb 2 – Mar 8, 41 sap days4120052005: Feb 11 – Mar 18, 34 sap days3420042004: Feb 25 – Mar 25, 36 sap days3620032003: Mar 8 – Mar 15, 23 sap days2320022002: Feb 1 – Mar 6, 50 sap days5020012001: Feb 25 – Apr 1, 39 sap days3920002000: Jan 30 – Mar 6, 42 sap days4219991999: Feb 14 – Mar 21, 51 sap days5119981998: Jan 26 – Feb 16, 49 sap days4919971997: Feb 3 – Mar 9, 44 sap days4419961996: Feb 11 – Mar 18, 39 sap days3919951995: Feb 15 – Mar 11, 37 sap days3719941994: Feb 21 – Mar 26, 38 sap days3819931993: Feb 25 – Mar 20, 34 sap days3419921992: Jan 29 – Mar 2, 51 sap days5119911991: Feb 13 – Mar 17, 40 sap days40
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Greenville. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Darke County in the Census of Agriculture

USDA counts maple operations every five years. In Darke County the 2022 Census found 6 farms making syrup (+50% since 2017), with taps +105% and syrup output +129% over the same five years. That works out to about 0.21 gallons of syrup per tap in 2022 (0.19 in 2017). Among the 385 counties in this atlas, Darke County ranks 353 by taps.

Darke County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
20226154320.21
2017475140.19

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 Greenville (1,047ft), 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 Ohio's USDA record (8 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 — Ohio, 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

Darke County sugaring questions

When should I tap maple trees in Darke County, Ohio?
In a typical year the sap starts running around February 16 near Greenville and the season winds down around March 25. 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 15 and as late as Mar 8.
How much maple syrup does Darke County produce?
The 2022 Census of Agriculture counted 6 maple operations in Darke County with 154 taps producing 32 gallons of syrup, ranking 55 of 63 Ohio's counties with published tap counts.
How many sap days does Darke County get in a season?
On average 38.7 freeze-thaw sap days from December through May at Greenville, of which about 14 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2018 (52 sap days); the leanest was 2003 (23).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Greenville (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for Ohio. 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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