Conditional — Some Areas
mountain laurel (zones 5-11) has limited zone overlap with New Hampshire (3b-6a). Only zones 5-6 in the state are suitable.
Your yard isn't the whole zone.
New Hampshire spans zones 3b-6a, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score mountain laurel against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Mountain Laurel Needs
- USDA Zones: 5-11
- Soil pH: 4.5 - 5.5
- Sun: Shade
- Frost-Free Days: 150+
New Hampshire Has
- USDA Zones: 3b-6a
- Last Frost: May 1 - Jun 1
- First Frost: Sep 10 - Oct 10
- Annual Rainfall: 36-50 inches
- Common Soils: Glacial till, Sandy loam, Rocky loam
Plant Zone Range (zones 5-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Mountain Laurel in New Hampshire
The frost window
Across New Hampshire, the last spring frost clears between May 1 and Jun 1, and the first fall frost lands between Sep 10 and Oct 10 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 101-day window you can count on — up to 162 days on a mild site in a kind year.
Frost hardiness
Mountain Laurel is cold-hardy to -23°F (USDA PLANTS Database), so you can plant on the early side of New Hampshire's window — even a few weeks before the final frost date.
Establishment timing
As a long-lived plant, mountain laurel isn't racing the calendar to a harvest date. Plant it in spring once the last-frost window passes so roots settle in through the full season, or in early fall while the soil still holds summer warmth.
Timing tuned to sub-state frost dates — Coos County, not the statewide average.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Mountain Laurel wants 150+ frost-free days; a typical New Hampshire site sees ~170 (NOAA Climate Normals). That leaves a workable window — start indoors to bank time.
Chill hours
Mountain Laurel requires ~600 chill hours (32-45°F dormancy window). New Hampshire typically banks ~1500 chill hours per winter (MSU Extension method), which keeps this plant on track.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Mountain Laurel prefers acidic soil (pH 4.5-5.5). New Hampshire's glacial till can run on the acidic side, which often aligns well — confirm with a soil test before planting.
Your land, not the state average
New Hampshire's soils run mostly fine sandy loam, but SSURGO maps the series, texture, and drainage under your exact parcel — that map unit, not the state average, decides how mountain laurel performs.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. New Hampshire soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Mountain Laurel in New Hampshire — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 5-11 (USDA PLANTS Database)
- State Zones: 3b-6a (USDA ARS PHZM 2023)
- Growing Season: May 1 - Jun 1 to Sep 10 - Oct 10 (NOAA Climate Normals)
What Else to Consider
Zone compatibility tells you about winter cold survival — but New Hampshire growers also need to think about:
Very short season in the White Mountains (80-100 frost-free days)
In the mountains, fast varieties plus a cold frame or hoop house turn 90 days into a working season.
Rocky glacial soils throughout the state
Build up rather than dig out — a raised bed over cleared ground beats fighting granite for every planting hole.
Harsh winters with deep snow cover
Deep snow is a blanket, not a threat — plant to your true zone and the cover protects what the cold would test.
Growing mountain laurel here specifically
Mountain Laurel needs pH 4.5–5.5; New Hampshire's dominant fine sandy loam soils may or may not deliver that, so your parcel's SSURGO map unit is the real test.
Start with a soil test on your own ground and adjust pH and texture to fit mountain laurel's 4.5–5.5 range. How to handle it →
Timing shifts within New Hampshire
New Hampshire isn't one climate. In Coos County, the last hard freeze (28°F) holds until about Apr 27 — roughly 11 days later than the recorded state median — so plant mountain laurel to your county's window, not the statewide date.
County last-freeze dates: NOAA/PRISM Climate Normals 1991-2020, 28°F threshold (earlier than the folk 32°F "last frost"). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Mountain Laurel draws pollinators (moderate value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Good to Know Before You Plant Mountain Laurel
Mountain Laurel is listed as toxic to dogs, cats, horses (all) at a severe level (ASPCA). Most listed plants only cause brief upset — a raised bed or a fenced corner usually keeps curious pets clear.
New Hampshire Cooperative Extension
For New Hampshire-specific cultivar recommendations, planting calendars, and pest pressure for mountain laurel, the canonical source is UNH Cooperative Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Mountain Laurel native to New Hampshire?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Mountain Laurel as native to New Hampshire. Planting it supports the pollinators and wildlife that evolved alongside it.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Mountain Laurel in New Hampshire
When can I plant Mountain Laurel in New Hampshire?
New Hampshire's last spring frost clears between May 1 and Jun 1, and the first fall frost lands between Sep 10 and Oct 10 (NOAA Climate Normals 1991-2020). Mountain Laurel is a long-lived planting, so target spring just after your local last frost — or early fall while the soil holds warmth — and let it establish through the season.
What hardiness zone is Mountain Laurel grown in across New Hampshire?
New Hampshire spans USDA hardiness zones 3b-6a (USDA ARS PHZM 2023). Mountain Laurel carries a range of zones 5-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical New Hampshire site have?
A typical New Hampshire site sees ~170 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Mountain Laurel needs 150+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like Coos, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Mountain Laurel native to New Hampshire?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Mountain Laurel as native to New Hampshire. Planting it supports the pollinators and wildlife that evolved alongside it.
How should I amend the soil for Mountain Laurel in New Hampshire?
Mountain Laurel prefers pH 4.5-5.5 (USDA PLANTS Database). Most New Hampshire soils run mildly acidic to neutral; many sites land near this band naturally, and a soil test plus targeted sulfur or organic amendment closes any gap.
Will Mountain Laurel actually grow on my specific land in New Hampshire?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores mountain laurel against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in New Hampshire
State-level data is a sketch. Your Growable Ground report scores mountain laurel against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →