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New Hampshire · county maple atlas

Maple sugaring in Grafton County, New Hampshire

Grafton County had 78 maple operations and 68,184 taps in the 2022 Census, number 3 in New Hampshire. Around North Haverhill, sap usually runs from March 6 to April 15. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 151 days until the usual start.
Sap starts
Mar 6
typical year
Season ends
Apr 15
about 6 weeks
Sap days / season
48.6
1991–2026 average
Taps, 2022
68,184
#3 of 10 in NH

Sap-flow outlook at North Haverhill right now

Full New Hampshire forecast →

Forecast for North Haverhill, NH

Updated Oct 6, 6:54 AM EDT

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    35° / 63°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    46° / 65°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    40° / 58°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    38° / 58°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    39° / 67°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    48° / 68°
    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 North Haverhill

Freeze-thaw weather at North Haverhill peaks in the weeks of Mar 2 to Apr 13, which hold about 50% of a season's sap days. March is the busiest month.
Typical season: Mar 6 – Apr 150246Week of Dec 1: 2.1 sap days on averageWeek of Dec 8: 1.9 sap days on averageWeek of Dec 15: 1.7 sap days on averageWeek of Dec 22: 1.4 sap days on averageWeek of Dec 29: 1.4 sap days on averageWeek of Jan 5: 0.8 sap days on averageWeek of Jan 12: 1.1 sap days on averageWeek of Jan 19: 0.9 sap days on averageWeek of Jan 26: 1.1 sap days on averageWeek of Feb 2: 1.3 sap days on averageWeek of Feb 9: 1.2 sap days on averageWeek of Feb 16: 2.0 sap days on averageWeek of Feb 23: 2.2 sap days on averageWeek of Mar 2: 2.9 sap days on averageWeek of Mar 9: 3.3 sap days on averageWeek of Mar 16: 3.4 sap days on averageWeek of Mar 23: 4.1 sap days on averageWeek of Mar 30: 4.0 sap days on averageWeek of Apr 6: 3.9 sap days on averageWeek of Apr 13: 3.0 sap days on averageWeek of Apr 20: 2.2 sap days on averageWeek of Apr 27: 1.6 sap days on averageWeek of May 4: 0.6 sap days on averageWeek of May 11: 0.4 sap days on averageWeek of May 18: 0.3 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Mar 6
Average number of freeze-thaw sap days in each week of the season at North Haverhill, 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 Mar 14; the middle half of seasons fell between Mar 7 and Mar 18. Earliest Feb 16 (2012), latest Mar 24 (2001).
Closing signal
Median Apr 17; middle half between Apr 11 and Apr 19. Earliest Mar 14 (2012), latest Apr 28 (2001).
Sap days by month
Dec16%Jan9%Feb14%Mar31%Apr27%May3%

36 seasons of sap weather

Grafton County seasons, 1991–2026

The best sap year at North Haverhill was 2023 with 68 freeze-thaw days; the leanest was 2003 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: Mar 10 – Apr 12, 39 sap days3920252025: Mar 12 – Apr 14, 35 sap days3520242024: Mar 5 – Apr 9, 58 sap days5820232023: Mar 10 – Apr 11, 68 sap days6820222022: Mar 5 – Apr 9, 50 sap days5020212021: Mar 4 – Apr 5, 40 sap days4020202020: Mar 10 – Apr 13, 67 sap days6720192019: Mar 18 – Apr 18, 40 sap days4020182018: Mar 23 – Apr 24, 54 sap days5420172017: Mar 11 – Apr 15, 42 sap days4220162016: Feb 27 – Apr 1, 60 sap days6020152015: Mar 24 – Apr 25, 35 sap days3520142014: Mar 18 – Apr 21, 46 sap days4620132013: Mar 13 – Apr 16, 62 sap days6220122012: Feb 16 – Mar 14, 61 sap days6120112011: Mar 20 – Apr 23, 39 sap days3920102010: Feb 27 – Mar 29, 45 sap days4520092009: Mar 14 – Apr 17, 43 sap days4320082008: Mar 17 – Apr 18, 50 sap days5020072007: Mar 19 – Apr 22, 46 sap days4620062006: Mar 7 – Apr 11, 49 sap days4920052005: Mar 14 – Apr 17, 51 sap days5120042004: Mar 16 – Apr 18, 45 sap days4520032003: Mar 17 – Apr 19, 32 sap days3220022002: Mar 12 – Apr 12, 53 sap days5320012001: Mar 24 – Apr 28, 43 sap days4320002000: Mar 5 – Apr 8, 57 sap days5719991999: Mar 14 – Apr 17, 58 sap days5819981998: Mar 6 – Apr 10, 57 sap days5719971997: Mar 21 – Apr 23, 50 sap days5019961996: Mar 18 – Apr 20, 40 sap days4019951995: Mar 15 – Apr 18, 48 sap days4819941994: Mar 17 – Apr 21, 48 sap days4819931993: Mar 13 – Apr 15, 42 sap days4219921992: Mar 23 – Apr 17, 44 sap days4419911991: Mar 4 – Apr 4, 54 sap days54
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at North Haverhill. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Grafton County in the Census of Agriculture

USDA counts maple operations every five years. In Grafton County the 2022 Census found 78 farms making syrup (0% since 2017), with taps -20% and syrup output -6% over the same five years. That works out to about 0.21 gallons of syrup per tap in 2022 (0.18 in 2017). Among the 385 counties in this atlas, Grafton County ranks 43 by taps.

Grafton County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
20227868,18414,4160.21
20177884,76315,3940.18

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 North Haverhill (417ft), 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 New Hampshire'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 — New Hampshire, 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

Grafton County sugaring questions

When should I tap maple trees in Grafton County, New Hampshire?
In a typical year the sap starts running around March 6 near North Haverhill and the season winds down around April 15. 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 Feb 16 and as late as Mar 24.
How much maple syrup does Grafton County produce?
The 2022 Census of Agriculture counted 78 maple operations in Grafton County with 68,184 taps producing 14,416 gallons of syrup, ranking 3 of 10 New Hampshire's counties with published tap counts.
How many sap days does Grafton County get in a season?
On average 48.6 freeze-thaw sap days from December through May at North Haverhill, of which about 13.1 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2023 (68 sap days); the leanest was 2003 (32).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at North Haverhill (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for New Hampshire. 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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