Conditional — Some Areas
Hubbard squash (zones 2-11) has limited zone overlap with Maryland (5b-8a). Only zones 5-8 in the state are suitable.
Your yard isn't the whole zone.
Maryland spans zones 5b-8a, but your yard has its own microclimate — slope, trees, and low spots shift frost and sun across a single parcel. Enter your address and we'll score hubbard squash against your land's actual soil, sun, and frost.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Zone Comparison
Hubbard Squash Needs
- USDA Zones: 2-11
- Soil pH: 5 - 8.5
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 80+
Maryland Has
- USDA Zones: 5b-8a
- Last Frost: Mar 25 - May 5
- First Frost: Oct 5 - Nov 5
- Annual Rainfall: 36-48 inches
- Common Soils: Silt loam, Clay, Sandy loam (Eastern Shore)
Plant Zone Range (zones 2-11)
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 Hubbard Squash in Maryland
The frost window
Across Maryland, the last spring frost clears between Mar 25 and May 5, and the first fall frost lands between Oct 5 and Nov 5 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 153-day window you can count on — up to 225 days on a mild site in a kind year.
Frost tenderness
Hubbard Squash is frost-tender — its listed minimum temperature is 48.2°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Days to maturity vs. the window
At 100 days to maturity (USDA PLANTS Database), a planting right after last frost ripens with 53 days to spare even in Maryland's tightest frost scenario — room for a later start or a second sowing.
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
Hubbard Squash wants 80+ frost-free days; a typical Maryland site sees ~190 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Hubbard Squash needs ~2200 GDD (base 50°F) to ripen. The state median runs ~3500 GDD (USDA NRCS county aggregates), so Maryland's typical season clears that easily.
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
Hubbard Squash likes near-neutral soil (pH 5-8.5). That's the common-ground band across Maryland's silt loam and clay — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Maryland site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. Maryland soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Hubbard Squash in Maryland — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 2-11 (USDA PLANTS Database)
- State Zones: 5b-8a (USDA ARS PHZM 2023)
- Growing Season: Mar 25 - May 5 to Oct 5 - Nov 5 (NOAA Climate Normals)
- Days to Maturity: 100 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Maryland growers also need to think about:
Heavy Piedmont clay drains poorly
A raised bed today, compost every fall — Piedmont clay becomes an asset once the drainage is yours.
Humidity and heat in summer promote disease
Morning watering at the base, room to breathe between plants, resistant varieties — the humid-summer basics, per your extension.
Deer pressure in suburban areas is extreme
A tall fence is the answer that holds; for everything outside it, lean toward the plants deer reliably skip.
Pollinator + Wildlife Value
Hubbard Squash draws pollinators (moderate value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Maryland Cooperative Extension
For Maryland-specific cultivar recommendations, planting calendars, and pest pressure for hubbard squash, the canonical source is University of Maryland Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Hubbard Squash native to Maryland?
No — the USDA PLANTS Database lists Hubbard Squash as introduced rather than native in the Lower 48, so it is not part of Maryland's native flora. It grows here as a garden plant; pairing it with a few Maryland natives keeps local pollinators fed too.
Looking for plants that belong here? The Maryland growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Hubbard Squash in Maryland
When can I plant Hubbard Squash in Maryland?
Maryland's last spring frost clears between Mar 25 and May 5, and the first fall frost lands between Oct 5 and Nov 5 (NOAA Climate Normals 1991-2020). Hubbard Squash is frost-tender — its listed minimum temperature is 48.2°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Hubbard Squash mature before first frost in Maryland?
Yes — Hubbard Squash matures in 100 days (USDA PLANTS Database), and Maryland's dependable frost-free window runs 153 days (NOAA Climate Normals 1991-2020), leaving 53 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Hubbard Squash grown in across Maryland?
Maryland spans USDA hardiness zones 5b-8a (USDA ARS PHZM 2023). Hubbard Squash carries a range of zones 2-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Maryland site have?
A typical Maryland site sees ~190 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Hubbard Squash needs 80+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Hubbard Squash native to Maryland?
No — the USDA PLANTS Database lists Hubbard Squash as introduced rather than native in the Lower 48, so it is not part of Maryland's native flora. It grows here as a garden plant; pairing it with a few Maryland natives keeps local pollinators fed too.
How should I amend the soil for Hubbard Squash in Maryland?
Hubbard Squash prefers pH 5-8.5 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Maryland soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Hubbard Squash actually grow on my specific land in Maryland?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores hubbard squash 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 Maryland
State-level data is a sketch. Your Growable Ground report scores hubbard squash 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