When is the last frost in Hines, OR?

For ZIP code 97738, the average last spring frost (32°F) is June 11, based on NOAA 1991-2020 climate normals for the Burns Muni Ap, OR weather station. There is a 1-in-10 chance of a frost after June 28.

When is the first frost in Hines, OR?

The average first fall frost (32°F) is September 6. There is a 1-in-10 chance of frost by August 21, so tender plants are at risk from that point on.

How long is the growing season in 97738?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 85 days long.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 97738Hines, OR

The average last spring frost in Hines is June 11 and the average first fall frost is September 6, giving a typical growing season of about 85 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 11
Average first fall frost: Sep 6
Growing season: 85 days

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	—	—	57 days	100%
Frost / freeze (32°F)	May 21 · Jun 11 · Jun 28	Aug 21 · Sep 6 · Sep 20	85 days	100%
Hard freeze (28°F)	May 2 · May 20 · Jun 14	Sep 3 · Sep 19 · Oct 3	120 days	100%

Where these dates come from

ZIP code 97738 is matched to the NOAA station Burns Muni Ap, OR, 11 km away, at 4,140 ft elevation (10 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Burns Muni Ap, OR (used)	4,140 ft	Jun 11	Sep 6
O O Rch, OR	4,136 ft	Jun 11	Sep 6
Malheur Refuge Hq, OR	4,118 ft	May 29	Sep 18
Riley 10 Wsw, OR	4,583 ft	Jun 11	Sep 11

Frost dates near Hines

Burns, OR 97720 · last Jun 11, first Sep 6
Crane, OR 97732 · last Jun 11, first Sep 6
Princeton, OR 97721 · last Jun 11, first Sep 6
Drewsey, OR 97904 · last Jun 5, first Sep 5
Seneca, OR 97873 · last —, first —
Riley, OR 97758 · last Jun 11, first Sep 28
Diamond, OR 97722 · last May 29, first Sep 18
Riverside, OR 97917 · last Jun 7, first Sep 6

Frequently asked questions

When is the last frost in Hines, OR?: For ZIP code 97738, the average last spring frost (32°F) is June 11, based on NOAA 1991-2020 climate normals for the Burns Muni Ap, OR weather station. There is a 1-in-10 chance of a frost after June 28.
When is the first frost in Hines, OR?: The average first fall frost (32°F) is September 6. There is a 1-in-10 chance of frost by August 21, so tender plants are at risk from that point on.
How long is the growing season in 97738?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 85 days long.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.