Frost dates for 84405Ogden, UT
The average last spring frost in Ogden is April 22 and the average first fall frost is October 22, giving a typical growing season of about 180 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 22
- Average first fall frost
- Oct 22
- Growing season
- 180 days
Safer after May 10 (1-in-10 risk)
Possible by Oct 7 (1-in-10 risk)
Last frost typically in 171 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.
| 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) | Apr 22 · May 8 · May 31 | Sep 28 · Oct 11 · Oct 25 | 155 days | 100% |
| Frost / freeze (32°F) | Apr 4 · Apr 22 · May 10 | Oct 7 · Oct 22 · Nov 6 | 180 days | 100% |
| Hard freeze (28°F) | Mar 13 · Apr 3 · Apr 21 | Oct 18 · Nov 2 · Nov 17 | 210 days | 100% |
Planting calendar for Ogden
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 22 – May 28 |
| Tomatoes | Transplant outdoors | May 8 – Jul 2 |
| Peppers | Start seeds indoors | Mar 22 – Apr 22 |
| Peppers | Transplant outdoors | May 22 – Jun 22 |
| Eggplant | Start seeds indoors | Apr 8 – May 7 |
| Eggplant | Transplant outdoors | May 22 – Jun 22 |
| Cucumbers | Sow outdoors | May 22 – Jul 12 |
| Summer squash | Sow outdoors | May 8 – Jun 22 |
| Winter squash & pumpkins | Sow outdoors | May 22 – Jun 22 |
| Snap beans | Sow outdoors | May 8 – Aug 4 |
| Sweet corn | Sow outdoors | May 8 – Jul 2 |
| Watermelon & cantaloupe | Sow outdoors | May 22 – Jun 22 |
| Okra | Sow outdoors | May 15 – Jun 7 |
| Peas | Sow outdoors (spring) | Mar 22 – May 7 |
| Potatoes | Plant outdoors (spring) | Mar 22 – May 22 |
| Onions | Start seeds indoors (spring) | Feb 8 – Mar 7 |
| Onions | Transplant outdoors (spring) | Apr 8 – May 7 |
| Broccoli | Start seeds indoors (spring) | Mar 4 – Apr 7 |
| Broccoli | Transplant outdoors (spring) | Apr 8 – May 7 |
| Broccoli | Start seeds indoors (fall) | Jun 22 – Jul 2 |
| Broccoli | Transplant outdoors (fall) | Jul 22 – Aug 2 |
| Cabbage | Start seeds indoors (spring) | Feb 22 – Mar 22 |
| Cabbage | Transplant outdoors (spring) | Mar 22 – Apr 22 |
| Cabbage | Start seeds indoors (fall) | Jun 12 – Jul 12 |
| Cabbage | Transplant outdoors (fall) | Jul 12 – Aug 12 |
| Leaf lettuce | Sow outdoors (spring) | Mar 22 – Jun 7 |
| Leaf lettuce | Sow outdoors (fall) | Jul 12 – Aug 28 |
| Spinach | Sow outdoors (spring) | Mar 15 – Apr 28 |
| Spinach | Sow outdoors (fall) | Jul 29 – Sep 2 |
| Radishes | Sow outdoors (spring) | Mar 22 – May 12 |
| Radishes | Sow outdoors (fall) | Jul 12 – Sep 12 |
| Kale | Sow outdoors (spring) | Apr 8 – Apr 28 |
| Kale | Sow outdoors (fall) | Jul 5 – Aug 12 |
| Carrots | Sow outdoors (spring) | Apr 22 – Jun 7 |
| Carrots | Sow outdoors (fall) | Jun 12 – Jul 28 |
| Garlic | Plant outdoors (fall) | Oct 12 – Nov 12 |
Where these dates come from
ZIP code 84405 is matched to the NOAA station Ogden Hinkley Ap, UT, 3.6 km away, at 4,470 ft elevation (113 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Ogden Hinkley Ap, UT (used) | 4,470 ft | Apr 22 | Oct 22 |
| Ogden Sugar Factory, UT | 4,280 ft | Apr 22 | Oct 18 |
| Ogden Pioneer Ph, UT | 4,350 ft | Apr 21 | Oct 23 |
| Ogden Ne Bench, UT | 4,572 ft | Apr 19 | Oct 22 |
Frost dates near Ogden
- Ogden, UT 84403 · last Apr 22, first Oct 22
- Roy, UT 84067 · last Apr 22, first Oct 22
- Hill Afb, UT 84056 · last Apr 22, first Oct 22
- Clearfield, UT 84015 · last Apr 22, first Oct 22
- Layton, UT 84041 · last Apr 22, first Oct 22
- Syracuse, UT 84075 · last Apr 22, first Oct 18
- Hooper, UT 84315 · last Apr 22, first Oct 18
- Kaysville, UT 84037 · last Apr 19, first Oct 19
Frequently asked questions
- When is the last frost in Ogden, UT?
- For ZIP code 84405, the average last spring frost (32°F) is April 22, based on NOAA 1991-2020 climate normals for the Ogden Hinkley Ap, UT weather station. There is a 1-in-10 chance of a frost after May 10.
- When is the first frost in Ogden, UT?
- The average first fall frost (32°F) is October 22. There is a 1-in-10 chance of frost by October 7, so tender plants are at risk from that point on.
- How long is the growing season in 84405?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 180 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.