Rhode Island planting calendar

When to plant celery in Rhode Island — sow, transplant & harvest dates

Rhode Island is mostly USDA zone 7a (range 6a-7b). Dates below are derived from celery's frost tolerance and Rhode Island's frost window — not generic national averages.

Celery planting timetable for Rhode Island

Stage	When in Rhode Island	Anchor
Start seeds indoors	mid-February (February 14)	10 weeks before the last frost (late April)
Transplant outside	mid-April (April 11)	14 days before the last frost (late April)
First harvest (estimate)	early August (August 4)	~115 days from transplant

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why Rhode Island's climate shifts the celery dates

Rhode Island's last spring frost averages late April and first fall frost mid-October, which sets the whole planting clock. Rhode Island is small and ocean-moderated, with a long season near the bay and only a slightly cooler interior. Sow early — celery bolt once daytime temperatures hold above 24 °C, so the earlier they go in, the longer the harvest.

Celery is one of the most demanding cool-season crops: it germinates slowly at 15-21 °C and needs 10-12 weeks of indoor growing time before transplanting out 2-4 weeks before the last spring frost. Temperatures below 10 °C for more than 10 consecutive days can trigger premature bolting, so protect young transplants with row cover in cold snaps. In zones 9-10 celery is typically grown as a winter/spring crop, started in late summer; in zones 3-6 the short cool window before summer heat sets in makes consistent irrigation and blanching (hilling or wrapping stems) essential for tender, mild stalks.

Frost-risk note

Don't plant before late April — a hard freeze can still set young plants back. In the northwest interior near Foster (zone 6a) the safe date runs a week or two later.

Regional variation within Rhode Island

the northwest interior near Foster (zone 6a) runs roughly 1-2 weeks behind the state average; the Narragansett Bay shore and Newport (zone 7b) can plant 1-2 weeks earlier.

Providence — USDA zone 7a
Warwick — USDA zone 7a
Newport — USDA zone 7b
Cranston — USDA zone 7a

What else to plant in Rhode Island around then

The same early window suits peas, lettuce, spinach, and onion sets.

Quick-grow guide

Sun: Full sun — 6+ hours direct.
Soil temperature for germination: 15-21 °C (60-70 °F).
Spacing: 8-12 inches (20-30 cm) between plants.
Days to harvest: ~115 days from planting out.

Frequently asked questions

When is the best time to plant celery in Rhode Island?

In Rhode Island (mostly USDA zone 7a), sow celery indoors around mid-February, transplant outdoors mid-April (before the last frost, late April), and harvest from early August. Celery are half-hardy — young plants shrug off a light frost but not a hard freeze, so sowing can start a couple of weeks before the last spring frost.

What USDA zone is Rhode Island?

Most of Rhode Island sits in USDA hardiness zone 7a, with the state spanning roughly 6a-7b from the northwest interior near Foster (zone 6a) to the Narragansett Bay shore and Newport (zone 7b). The last spring frost averages late April and the first fall frost mid-October.

Can you grow celery in Rhode Island?

Yes. Rhode Island's dominant zone 7a supports celery — the key is timing. Celery are half-hardy — young plants shrug off a light frost but not a hard freeze, so sowing can start a couple of weeks before the last spring frost.

Does the planting date change across Rhode Island?

the northwest interior near Foster (zone 6a) runs roughly 1-2 weeks behind the state average; the Narragansett Bay shore and Newport (zone 7b) can plant 1-2 weeks earlier.

What else can I plant in Rhode Island around the same time?

The same early window suits peas, lettuce, spinach, and onion sets.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.