Frost Dates for Rexburg, ID 83440
Last spring frost June 9 · First fall frost September 9 · 92 frost-free days · USDA Zone 5a
ZIP 83440 has about 51,400 people, the largest of 2 ZIP codes in Rexburg.
Short season: 92 frost-free days. Spring frost risk spans May 19–June 29 (41 days). Fall frost risk spans August 23–September 26 (34 days).
Frost probability for 83440
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 29 | June 9 | May 19 |
| Fall (first frost) | August 23 | September 9 | September 26 |
Dates come from NOAA 1971–2000 freeze probabilities at ASHTON 1N (40.3 km away); the 50% date is the median year.
Frost dates by ZIP code in Rexburg, ID
| ZIP | Last spring frost (50%) | First fall frost (50%) | Zone |
|---|---|---|---|
| 83440 | June 9 | September 9 | 5a |
| 83460 | June 9 | September 9 | 5a |
Which crops fit a 92-day season in Rexburg
In Rexburg (92 frost-free days, a short season), 29 of 56 planner crops fit outright, 13 get two plantings, 4 need an indoor start, 9 don't reliably mature, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | May 5 | Jun 23–Jun 30 | 50 | no-fit: Needs 80 days; Rexburg has 50 after Jun 23. | — |
| Pepper | Apr 28 | Jun 23–Jun 30 | 50 | no-fit: Needs 75 days; Rexburg has 50 after Jun 23. | — |
| Lettuce | Apr 14 | May 12–May 19 | 127 | two-plantings: Plant May 12 and again by Jul 19; both mature before Sep 16. | Jul 19 |
| Carrots | — | May 19–May 26 | 134 | fits: 70 days to maturity, 134 available after May 19. | Jul 8 |
| Cucumber | May 19 | Jun 23–Jun 30 | 64 | fits: 60 days to maturity, 64 available after Jun 23. | — |
| Beans | — | Jun 16–Jun 30 | 78 | fits: 60 days to maturity, 78 available after Jun 16. | Jun 20 |
| Peas | — | Apr 14–Jun 23 | 155 | fits: 65 days to maturity, 155 available after Apr 14. | Jun 29 |
| Zucchini | May 26 | Jun 23–Jun 30 | 64 | fits: 55 days to maturity, 64 available after Jun 23. | — |
| Onion | Mar 17 | May 12–May 26 | 127 | fits: 100 days to maturity, 127 available after May 12. | — |
| Spinach | — | Apr 14–Jun 2 | 169 | two-plantings: Plant Apr 14 and again by Aug 7; both mature before Sep 30. | Aug 7 |
| Kale | Mar 31 | May 12–May 26 | 141 | two-plantings: Plant May 12 and again by Jul 23; both mature before Sep 30. | Jul 23 |
| Broccoli | Apr 14 | May 12–May 26 | 127 | fits: 80 days to maturity, 127 available after May 12. | Jun 14 |
| Cabbage | Apr 14 | May 12–May 26 | 141 | fits: 70 days to maturity, 141 available after May 12. | Jul 8 |
| Radish | — | Apr 14–Jul 7 | 155 | two-plantings: Plant Apr 14 and again by Aug 8; both mature before Sep 16. | Aug 8 |
| Beets | — | Apr 14–Jul 7 | 155 | two-plantings: Plant Apr 14 and again by Jul 9; both mature before Sep 16. | Jul 9 |
| Potatoes | — | May 26–Jun 2 | 113 | fits: 90 days to maturity, 113 available after May 26. | — |
| Garlic | — | Sep 9 | 197 | overwinter: Plant Sep 9 to Sep 30; harvest the following summer. | Sep 30 |
| Strawberry | — | May 5–Jun 30 | 148 | perennial: A perennial: plant May 5; it fruits from the following year and keeps producing for several years. | — |
| Corn | May 12 | Jun 16–Jun 23 | 64 | head-start: Even planted out Jun 16, the outdoor season is about 11 days short; choose an early variety or grow under cover. | — |
| Pumpkin | May 26 | Jun 23–Jun 23 | 57 | no-fit: Needs 100 days; Rexburg has 57 after Jun 23. | — |
| Cauliflower | Apr 28 | Jun 2–Jun 16 | 106 | fits: 75 days to maturity, 106 available after Jun 2. | Jun 19 |
| Swiss Chard | Apr 14 | May 26–May 26 | 113 | fits: 55 days to maturity, 113 available after May 26. | Jul 9 |
| Arugula | — | Apr 14–Jul 7 | 169 | two-plantings: Plant Apr 14 and again by Aug 7; both mature before Sep 30. | Aug 7 |
| Brussel Sprouts | Apr 14 | May 12–May 26 | 141 | fits: 100 days to maturity, 141 available after May 12. | Jun 8 |
| Butternut Squash | May 26 | Jun 23–Jun 30 | 57 | no-fit: Needs 100 days; Rexburg has 57 after Jun 23. | — |
| Eggplant | Apr 21 | Jun 23–Jun 30 | 50 | head-start: Even planted out Jun 23, the outdoor season is about 20 days short; choose an early variety or grow under cover. | — |
| Okra | May 12 | Jun 16–Jun 23 | 71 | fits: 55 days to maturity, 71 available after Jun 16. | Jun 18 |
| Basil | May 5 | Jun 30–Jun 30 | 57 | head-start: Even planted out Jun 30, the outdoor season is about 3 days short; choose an early variety or grow under cover. | — |
| Cilantro | — | May 12–Jun 2 | 127 | two-plantings: Plant May 12 and again by Jul 14; both mature before Sep 16. | Jul 14 |
| Parsley | Mar 31 | Jun 16–Jun 23 | 92 | fits: 70 days to maturity, 92 available after Jun 16. | Jun 24 |
| Celery | Mar 31 | Jun 16–Jun 30 | 92 | no-fit: Needs 120 days; Rexburg has 92 after Jun 16. | — |
| Scallions | Mar 31 | May 12–May 26 | 141 | two-plantings: Plant May 12 and again by Jul 18; both mature before Sep 30. | Jul 18 |
| Turnip | — | May 12–May 26 | 141 | two-plantings: Plant May 12 and again by Jul 28; both mature before Sep 30. | Jul 28 |
| Kohlrabi | — | Apr 28–May 12 | 155 | two-plantings: Plant Apr 28 and again by Jul 23; both mature before Sep 30. | Jul 23 |
| Bok Choy | May 12 | Jun 2–Jun 9 | 106 | two-plantings: Plant Jun 2 and again by Jul 19; both mature before Sep 16. | Jul 19 |
| Collards | Mar 31 | May 12–May 26 | 141 | two-plantings: Plant May 12 and again by Jul 18; both mature before Sep 30. | Jul 18 |
| Cantaloupe | May 26 | Jun 23–Jun 30 | 50 | no-fit: Needs 85 days; Rexburg has 50 after Jun 23. | — |
| Chives | Mar 17 | Jun 16–Jun 23 | 106 | fits: 90 days to maturity, 106 available after Jun 16. | — |
| Dill | — | Apr 14–Jul 7 | 155 | two-plantings: Plant Apr 14 and again by Jul 9; both mature before Sep 16. | Jul 9 |
| Oregano | Mar 31 | Jun 16–Jun 23 | 106 | fits: 80 days to maturity, 106 available after Jun 16. | — |
| Rosemary | Mar 17 | Jun 16–Jun 23 | 92 | fits: 80 days to maturity, 92 available after Jun 16. | — |
| Sage | Apr 14 | Jun 16–Jun 23 | 106 | fits: 75 days to maturity, 106 available after Jun 16. | — |
| Thyme | Mar 31 | Jun 16–Jun 23 | 106 | fits: 90 days to maturity, 106 available after Jun 16. | — |
| Calendula | Apr 28 | May 26–Jun 9 | 113 | fits: 50 days to maturity, 113 available after May 26. | Jul 14 |
| Cosmos | May 12 | Jun 9–Jun 23 | 78 | fits: 60 days to maturity, 78 available after Jun 9. | Jun 13 |
| Lavender | Mar 17 | Jun 9–Jun 23 | 113 | fits: 90 days to maturity, 113 available after Jun 9. | — |
| Marigolds | Apr 28 | Jun 9–Jun 16 | 78 | fits: 50 days to maturity, 78 available after Jun 9. | Jun 23 |
| Melons | May 26 | Jun 23–Jun 30 | 50 | no-fit: Needs 85 days; Rexburg has 50 after Jun 23. | — |
| Mint | — | Jun 9–Jun 23 | 113 | fits: 90 days to maturity, 113 available after Jun 9. | — |
| Nasturtiums | May 12 | Jun 9–Jun 16 | 78 | fits: 55 days to maturity, 78 available after Jun 9. | Jun 18 |
| Pole Beans | — | Jun 16–Jun 30 | 71 | fits: 65 days to maturity, 71 available after Jun 16. | — |
| Spaghetti Squash | May 26 | Jun 23–Jun 30 | 57 | no-fit: Needs 90 days; Rexburg has 57 after Jun 23. | — |
| Sunflowers | — | Jun 9–Jun 23 | 78 | fits: 70 days to maturity, 78 available after Jun 9. | — |
| Tomatillos | Apr 14 | Jun 16–Jun 23 | 57 | head-start: Even planted out Jun 16, the outdoor season is about 18 days short; choose an early variety or grow under cover. | — |
| Watermelon | May 26 | Jun 16–Jun 23 | 57 | no-fit: Needs 80 days; Rexburg has 57 after Jun 16. | — |
| Yellow Squash | May 26 | Jun 23–Jun 30 | 64 | fits: 55 days to maturity, 64 available after Jun 23. | — |
| Zinnias | May 12 | Jun 9–Jun 23 | 78 | fits: 60 days to maturity, 78 available after Jun 9. | Jun 13 |
Month by month in Rexburg
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost). |
| March | Start indoors: Chives (Mar 17), Lavender (Mar 17), Onion (Mar 17), Rosemary (Mar 17), Celery (Mar 31), Collards (Mar 31), +5 more. |
| April | Start indoors: Broccoli (Apr 14), Brussel Sprouts (Apr 14), Cabbage (Apr 14), Lettuce (Apr 14), Sage (Apr 14), Swiss Chard (Apr 14), +6 more. Direct sow from: Arugula (Apr 14), Beets (Apr 14), Dill (Apr 14), Peas (Apr 14), Radish (Apr 14), Spinach (Apr 14), +1 more. |
| May | Start indoors: Basil (May 5), Tomato (May 5), Bok Choy (May 12), Corn (May 12), Cosmos (May 12), Nasturtiums (May 12), +11 more. Direct sow from: Cilantro (May 12), Turnip (May 12), Carrots (May 19), Potatoes (May 26). Transplant from: Broccoli (May 12), Brussel Sprouts (May 12), Cabbage (May 12), Collards (May 12), Kale (May 12), Lettuce (May 12), +4 more. Plant: Strawberry (May 5). |
| June | Direct sow from: Sunflowers (Jun 9), Beans (Jun 16), Pole Beans (Jun 16). Transplant from: Bok Choy (Jun 2), Cauliflower (Jun 2), Cosmos (Jun 9), Lavender (Jun 9), Marigolds (Jun 9), Mint (Jun 9), +25 more. Last frost around June 9. Last sowing dates: Brussel Sprouts (Jun 8), Cosmos (Jun 13), Zinnias (Jun 13), Broccoli (Jun 14), Nasturtiums (Jun 18), Okra (Jun 18), +5 more. |
| July | Last sowing dates: Cabbage (Jul 8), Carrots (Jul 8), Beets (Jul 9), Dill (Jul 9), Swiss Chard (Jul 9), Calendula (Jul 14), +8 more. |
| August | Last sowing dates: Arugula (Aug 7), Spinach (Aug 7), Radish (Aug 8). |
| September | Direct sow from: Garlic (Sep 9). First frost around September 9. Last sowing dates: Garlic (Sep 30). |
| October | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
| November | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Rexburg, ID (ZIP 83440)?
The median last spring frost date for Rexburg, ID (ZIP code 83440) is around June 9. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before May 19; one in ten it runs past June 29.
What is the first fall frost date in Rexburg, ID?
The median first fall frost date for Rexburg, ID is around September 9. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around August 23 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Rexburg, ID?
The frost-free growing season in Rexburg is about 92 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Rexburg (92 frost-free days, a short season), 29 of 56 planner crops fit outright, 13 get two plantings, 4 need an indoor start, 9 don't reliably mature, 1 crop is perennial.
What USDA hardiness zone is Rexburg, ID?
Rexburg, ID is in USDA hardiness zone 5a (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Rexburg, ID?
Start tomatoes indoors May 5 and plant out Jun 23 in Rexburg. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Rexburg?
Two: plant May 12 and again by Jul 19; both mature before Sep 16.
When do I plant garlic in Rexburg?
Sep 9 to Sep 30; it overwinters and is ready the following summer.
Can I grow Celery in Rexburg?
Not reliably outdoors. Needs 120 days; Rexburg has 92 after Jun 16.
Which nearby ZIP has a longer season?
Shelley (ZIP 83274) has 113 frost-free days, 21 more than Rexburg (ZIP 83440). See Shelley ZIP 83274 frost dates
Nearby and related
- Frost dates for Rigby, ID 83442 (12.6 mi)
- Frost dates for Idaho Falls, ID 83401 (19.4 mi)
- Frost dates for Shelley, ID 83274 (34.9 mi)
- Frost dates for Blackfoot, ID 83221 (50 mi)
- Frost dates for Jackson, WY 83001 (65.8 mi)
- When to plant in ID
- When to plant Beans in ID
- When to plant Strawberries in ID
- When to plant Beets in ID
- When to plant Broccoli in ID
- When to plant Carrots in ID
- When to plant Kale in ID
- Look up another ZIP