USDA Hardiness Zone 7a

Frost Dates for 47630 — Newburgh, Indiana

NOAA 1991–2020 normals from Newburgh L&D, IN (380 ft), 2 miles south.

Updated October 28, 2026

In Newburgh, the last spring frost (32°F) is around April 3 in half of years and has passed by April 17 in nine years out of ten. The first fall frost comes around November 2, as early as October 22 one year in ten, leaving a typical freeze-free season of 214 days (NOAA, Newburgh L&D, IN).

Last spring frost: April 3
First fall frost: November 2
Growing season: 214 days
Hardiness zone: 7a

First snow: December 25
Last snow: February 15
Winters with snow: 95%
Snow per year: 6.6"

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Frost risk by date in Newburgh

Half of springs at Newburgh L&D, IN see their last 32°F night by April 3; only one in ten is past it by March 18, and one in ten still has one after April 17. Planting tender crops after April 8 leaves a 30% risk of a frost on them, after April 12 20%, and after April 17 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 89% of the 125 Indiana stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 2 in half of years, as early as October 22 one year in ten, and holds off past November 16 one year in ten. A hard freeze of 28°F follows 11 days later, around November 13; in spring the one-in-ten date for 28°F is April 5, 12 days before the 32°F one. The freeze-free season lasts 214 days in a typical year, longer than at 97% of the 125 Indiana stations; it reaches 232 days one year in ten and falls short of 196 one year in ten. On average 89 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 11 days longer, to about April 14, and return around October 25. Severe cold of 16°F or below comes in 99% of winters, usually between December 19 and February 16.

Spring: the chance of another night this cold after the date
Low	90%	80%	70%	60%	50%	40%	30%	20%	10%
36°F	Apr 2	Apr 5	Apr 8	Apr 11	Apr 14	Apr 16	Apr 19	Apr 21	Apr 26
32°F	Mar 18	Mar 24	Mar 29	Mar 31	Apr 3	Apr 5	Apr 8	Apr 12	Apr 17
28°F	Mar 4	Mar 11	Mar 16	Mar 19	Mar 22	Mar 26	Mar 29	Mar 31	Apr 5
24°F	Feb 20	Feb 27	Mar 3	Mar 6	Mar 10	Mar 14	Mar 17	Mar 21	Mar 26
20°F	Feb 5	Feb 12	Feb 19	Feb 24	Feb 28	Mar 4	Mar 8	Mar 12	Mar 17
16°F99% of yrs	Jan 24	Feb 2	Feb 7	Feb 11	Feb 16	Feb 22	Feb 28	Mar 3	Mar 10

Fall: the chance the first night this cold has come by the date
Low	10%	20%	30%	40%	50%	60%	70%	80%	90%
36°F	Oct 12	Oct 17	Oct 20	Oct 23	Oct 25	Oct 27	Oct 30	Nov 1	Nov 5
32°F	Oct 22	Oct 26	Oct 30	Nov 1	Nov 2	Nov 5	Nov 7	Nov 11	Nov 16
28°F	Nov 1	Nov 5	Nov 7	Nov 10	Nov 13	Nov 15	Nov 19	Nov 23	Nov 30
24°F	Nov 7	Nov 12	Nov 16	Nov 20	Nov 24	Nov 27	Dec 1	Dec 5	Dec 12
20°F	Nov 16	Nov 23	Nov 27	Dec 1	Dec 4	Dec 8	Dec 14	Dec 20	Dec 28
16°F99% of yrs	Nov 28	Dec 3	Dec 8	Dec 14	Dec 19	Dec 24	Dec 29	Jan 2	Jan 13

Freeze probabilities 1991–2020 at Newburgh L&D, IN, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.

Frost risk on any date in 47630 →Compare Newburgh with another place →

Frost risk through the year in Newburgh

Frost curve for Newburgh, Indiana (Newburgh L&D, IN, NOAA 1991–2020): the chance of another 32°F night falls from 90% on March 18 to 50% on April 3 and 10% on April 17; the chance that the first fall one has come rises from 10% on October 22 to 50% on November 2 and 90% on November 16. — In Newburgh, the spring curve drops under 10% on April 17 and the fall curve passes 10% on October 22, 188 days later; that gap is longer than at 97% of the 125 Indiana stations with frost dates. The spring risk falls from 90% to 10% over 30 days (March 18 to April 17) and the fall risk climbs from 10% to 90% over 25 days (October 22 to November 16): both ends of the season vary about as much. At Boonville 1S, IN, 8 miles northeast, the same gap runs from April 28 to October 12, 21 days shorter.

Chance of a frost after each planting date in Newburgh
Planted on	Another 32°F night	28°F night
Mar 20	87%	57%
Mar 27	74%	37%
Apr 350% date	50%	14%
Apr 10	25%	under 10%
Apr 17	under 10%	under 10%
Apr 24	under 10%	under 10%

Weather by month in Newburgh

July is the warmest month at Newburgh L&D, IN, averaging 88°F by day and 69°F at night; January is the coldest at 43°F and 24°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 59% of years.

Warmth for growing adds up to 4,335 growing degree days a year (base 50°F), more than at 96% of the 125 Indiana stations. 37% of them (1,614) have built up by the end of June, and July adds the most, 886. Precipitation totals 47.6 inches a year, most in April (5.0") and least in October (3.1"); May to September bring 41% of it.

Monthly normals 1991–2020 at Newburgh L&D, IN
Month	High °F	Low °F	Precip. in	32°F night	Nights ≤ 32°F	GDD 50°F
Jan	43	24	3.5	100%	24	4
Feb	47	27	3.5	100%	20	9
Mar	57	35	4.6	99%	12	77
Apr	68	45	5.0	59%	3	241
May	77	57	5.0	0%	0	532
Jun	85	65	3.8	0%	0	751
Jul	88	69	4.0	0%	0	886
Aug	88	67	3.2	0%	0	845
Sep	82	60	3.6	0%	0	624
Oct	70	48	3.1	38%	<1	296
Nov	57	36	4.0	99%	12	59
Dec	47	28	4.3	100%	18	12

Monthly normals 1991–2020 at Newburgh L&D, IN (380 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.

Compared with the next station

The nearest other station, Boonville 1S, IN, 8 miles northeast of Newburgh, has a last frost 9 days later (April 12), a first frost 8 days earlier (October 25), a season 18 days shorter.

Frost dates for 47601 (Boonville) →

When it snows in Newburgh, Indiana

The first measurable snow (0.1 inch or more) in Newburgh usually arrives around December 25, and the last of the season around February 15. Those are the middle dates across the winters of 1991–2020 at Newburgh L&D, IN, 1.8 miles away: half of years saw snow earlier, half later. Snow fell in 95% of those winters. The last 32°F night of spring typically comes 47 days after the last snow.

Planting calendar for 47630

What to do and when, from the 50% frost dates for Newburgh, Indiana
When	What to do
January 23 – February 6	Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out.
February 6 – February 20	Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early.
March 6 – March 20	Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil.
April 3 onward	Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast.
by August 10	Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops.
by October 19	Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation.
November 2 onward	Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter.

The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.

Where these figures come from

ZIP 47630 is 2 miles from Newburgh L&D, IN, which stands at 380 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 47630 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.

Frost dates across Indiana →

Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.

Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.