Generally — Most Areas
flame azalea (zones 5-7) suits most of New Jersey (6a-8a) — zones 6-7 are in range, and the rest of the state is the exception.
Flame Azalea in New Jersey — the short answer
Flame Azalea in New Jersey: hardy in zones 5–7, part sun, against a state median of ~222 frost-free days.
- Plant zones
- 5-7
- Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
- New Jersey zones
- 6a-8a
- USDA PHZM 2023
- Frost window
- Mar 26 - Apr 4 – Nov 5 - Nov 17
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 196 days
- NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — per-field provenance varies and is published with the dataset.
Your yard isn't the whole zone.
New Jersey spans zones 6a-8a, 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 flame azalea against your parcel's actual hardiness, soil, and sun.
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New Jersey is not one climate
New Jersey’s winter-low ladder runs across 21 counties, from zone 6.5 in Morris County to zone 7.5 in Salem County. That is 10°F between the two counties’ average coldest night — the difference between flame azalea overwintering in the ground and coming under cover.
The middle half of 21 counties runs 7–7 zones, with a median of 7 zones — a 1-zone span end to end.
Measured across 21 New Jersey counties. USDA PHZM 2023, per county. Quartiles are order statistics — every figure shown is a value a real county recorded, not an interpolation. Your own site sits somewhere inside this range; a parcel report resolves where.
Where in New Jersey Fits Best
Flame Azalea is rated for zones 5–7 — a cold floor USDA puts at -20 to -10°F. Against New Jersey’s 21 counties that band holds in 16 of them, and the line runs at Morris County (zone 6b), the coldest county still inside it.
Inside zones 5–7
16 counties
- Sussex County · zone 6b
- Warren County · zone 6b
- Atlantic County · zone 7a
3 of 16 shown
Above the zone 7 ceiling
5 counties
- Cape May County · zone 7b
- Cumberland County · zone 7b
- Gloucester County · zone 7b
3 of 5 shown
Too little winter chill rather than too much cold — a low-chill selection is what changes it.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. A zone is a 10°F band of average annual extreme minimum temperature, so the floor above is the band the plant's rating denotes, not a single measured kill point. Slope, shelter and cold-air drainage routinely move a site half a zone either way from its county figure — which is the part only your address resolves.
Even within New Jersey's zones 6a-8a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for flame azalea (USDA PHZM 2023):
Zone Comparison
Flame Azalea Needs
- USDA Zones: 5-7
- Sun: Part Sun
- Mature size: 12 ft tall
- Drought tolerance: Low
New Jersey Has
- USDA Zones: 6a-8a
- Last Hard Freeze (28°F): Mar 26 - Apr 4
- First Hard Freeze (28°F): Nov 5 - Nov 17
- Annual Rainfall: 40-50 inches
- Common Soils: Sandy loam (Pine Barrens), Silt loam, Clay
Plant Zone Range (zones 5-7)
Preferred Soil pH
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS, and university Extension sources — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Flame Azalea in New Jersey
The frost window
Across New Jersey, the last spring hard freeze (28°F) clears between Mar 26 and Apr 4, and the first fall hard freeze lands between Nov 5 and Nov 17 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 215-day window you can count on — up to 236 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
Winter standing
New Jersey runs as cold as USDA zone 6, and no sourced winter-hardiness floor is on record for flame azalea, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether flame azalea is a permanent planting or a replant-every-spring crop for you turns on your own zone within New Jersey; check its hardiness range against that before treating it as long-lived ground.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Soil + Drainage Fit
Flame Azalea likes near-neutral soil (pH 4.5-6). That's the common-ground band across New Jersey's sandy loam (pine barrens) and silt loam — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 5 and 5.5 — worth knowing before you decide whether a New Jersey soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your New Jersey site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. New Jersey soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Flame Azalea in New Jersey
Zone compatibility tells you about winter cold survival — but New Jersey growers also need to think about:
Sandy Pine Barrens soils are nutrient-poor
Urban heat island effects in northern NJ
Deer browse is extreme in suburban areas
What to actually do about these — and the constraints that apply to every New Jersey grower, not just flame azalea — is covered on the New Jersey growing guide.
Where in New Jersey Flame Azalea Is Zone-Hardy
Flame Azalea is rated for USDA zones 5–7. 16 of New Jersey’s 21 counties fall inside that band. The coldest that does is Morris County at zone 6b. 5 counties sit above its zone 7 ceiling, where the limit is too little winter chill rather than too much cold. Where you are in New Jersey decides this one.
Across those 21 counties New Jersey’s winter-low ladder runs from zone 6b in Morris County to zone 7b in Salem County — 1 USDA zone of spread, which is 10°F between the two counties’ average coldest night of the year. That is why a statewide hardiness answer is where you start and not where you finish.
The planting window moves with it. Sussex County holds its last hard freeze (28°F) until about Apr 11, while Salem County is clear by Mar 20 — 22 days apart. Set flame azalea out on your county’s date, not the state’s.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F killing freeze — earlier than the folk 32°F "last frost". Flame Azalea’s zone 5–7 band: USDA PLANTS / Growable Ground plant database. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Pollinator + Wildlife Value
Flame Azalea draws honeybees, native bees, and butterflies (moderate value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, flame azalea can only work that bloom inside New Jersey's frost window — roughly 222 days, opening after the last 28°F freeze (Mar 26 - Apr 4) and closing at the first (Nov 5 - Nov 17), per NOAA Regional Climate Centers ACIS, 1991-2020.
New Jersey Cooperative Extension
For New Jersey-specific cultivar recommendations, planting calendars, and pest pressure for flame azalea, the canonical source is Rutgers Cooperative Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Flame Azalea native to New Jersey?
Flame Azalea is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in New Jersey. It can still earn a place in a New Jersey garden — the zone comparison above tells you whether it will thrive.
Looking for plants that belong here? The New Jersey 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 Flame Azalea in New Jersey
When can I plant Flame Azalea in New Jersey?
New Jersey's last spring hard freeze (28°F) clears between Mar 26 and Apr 4, and the first fall hard freeze lands between Nov 5 and Nov 17 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Flame Azalea, so this page does not state whether it overwinters in New Jersey and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Flame Azalea grown in across New Jersey?
New Jersey spans USDA hardiness zones 6a-8a (USDA ARS PHZM 2023). Flame Azalea carries a range of zones 5-7, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical New Jersey site have?
A typical New Jersey site sees ~222 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Flame Azalea should be matched against that window, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Flame Azalea native to New Jersey?
Flame Azalea is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in New Jersey. It can still earn a place in a New Jersey garden — the zone comparison above tells you whether it will thrive.
How should I amend the soil for Flame Azalea in New Jersey?
Flame Azalea prefers pH 4.5-6 and well (dry spells) drainage (Growable Ground Plant Database). That sits in the common-ground band across New Jersey soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Flame Azalea actually grow on my specific land in New Jersey?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores flame azalea 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 Jersey
State-level data is a sketch. Your Growable Ground report scores flame azalea against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that New Jersey flame azalea averages can't show:
We read public map data around New Jersey — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the New Jersey flame azalea average
Explore More
Growing guides for flame azalea
Explore New Jersey county by county
New Jersey carries 21 counties with their own USDA zone — a sample of the growing pages for flame azalea there:
Where else flame azalea grows
Flame Azalea's zone band crosses state lines — these are the states closest to New Jersey in winter climate where it also has a page, plus the far ends of its range. Each one re-answers the question with that state's own record.
More to grow in New Jersey
New Jersey has a growing page for 1,020 plants — a rotating sample of the rest of the shelf.
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